Typical work measurement form [2].
\r\n\tLiterature showed the presence of ACE2 receptors on the membrane of erythrocyte or red blood cell (RBC), indicating that erythrocyte (RBC) can be considered as a peripheral biomarker for SARS-C0V2 infection.
\r\n\r\n\tIncreased levels of glycolysis and fragmentation of RBC membrane proteins were observed in the SARS-C0V2 infected patients, demonstrating that not only RBC’s metabolism and proteome but its membrane lipidome could be influenced by SARS-C0V2 infection changing the homeostasis of the infected erythrocyte. This altered RBC may result in the clot and thrombus formation; the major signs of critically ill Covid-19 patients.
\r\n\r\n\tThis book is going to be a succinct source of knowledge not only for the specialists, researchers, academics and the students in this area but for the general public who are concern about the present situation and are interested in knowing about simple non-invasive measures for identifying viral and bacterial infections through their red blood cells.
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Cabanelas",slug:"juan-c.-cabanelas"}]},{id:"36179",title:"Use of FTIR Analysis to Control the Self-Healing Functionality of Epoxy Resins",slug:"use-of-ft-ir-analysis-to-control-the-self-healing-functionality-of-epoxy-resins",signatures:"Liberata Guadagno and Marialuigia Raimondo",authors:[{id:"106836",title:"Prof.",name:"Liberata",middleName:null,surname:"Guadagno",fullName:"Liberata Guadagno",slug:"liberata-guadagno"}]},{id:"36180",title:"Infrared Analysis of Electrostatic Layer-By-Layer Polymer Membranes Having Characteristics of Heavy Metal Ion Desalination",slug:"infrared-analysis-of-electrostatic-layer-by-layer-polymer-membranes-having-characteristics-of-heavy",signatures:"Weimin Zhou, Huitan Fu and Takaomi Kobayashi",authors:[{id:"110384",title:"Dr.",name:"Takaomi",middleName:null,surname:"Kobayashi",fullName:"Takaomi Kobayashi",slug:"takaomi-kobayashi"}]},{id:"36181",title:"Infrared Spectroscopy as a Tool to Monitor Radiation Curing",slug:"infrared-spectroscopy-as-a-tool-to-monitor-radiation-curing",signatures:"Marco Sangermano, Patrick Meier and Spiros Tzavalas",authors:[{id:"112286",title:"Dr.",name:"Spiros",middleName:null,surname:"Tzavalas",fullName:"Spiros Tzavalas",slug:"spiros-tzavalas"},{id:"114382",title:"Prof.",name:"Marco",middleName:null,surname:"Sangermano",fullName:"Marco Sangermano",slug:"marco-sangermano"},{id:"114384",title:"Dr",name:"Patrick",middleName:null,surname:"Meier",fullName:"Patrick Meier",slug:"patrick-meier"}]},{id:"36182",title:"Characterization of Compositional Gradient Structure of Polymeric Materials by FTIR Technology",slug:"characterization-of-compositional-gradient-structure-of-polymeric-materials-by-ft-ir-technology",signatures:"Alata Hexig and Bayar Hexig",authors:[{id:"20867",title:"Dr.",name:"Bayar",middleName:null,surname:"Hexig",fullName:"Bayar Hexig",slug:"bayar-hexig"},{id:"111986",title:"Dr.",name:"Alata",middleName:null,surname:"Hexig",fullName:"Alata Hexig",slug:"alata-hexig"}]},{id:"36183",title:"Fourier Transform Infrared Spectroscopy - Useful Analytical Tool for Non-Destructive Analysis",slug:"fourier-trasform-infrared-spectroscopy-useful-analytical-tool-for-non-destructive-analysis",signatures:"Simona-Carmen Litescu, Eugenia D. Teodor, Georgiana-Ileana Truica, Andreia Tache and Gabriel-Lucian Radu",authors:[{id:"24425",title:"Dr.",name:"Simona Carmen",middleName:null,surname:"Litescu",fullName:"Simona Carmen Litescu",slug:"simona-carmen-litescu"},{id:"24429",title:"Prof.",name:"Gabriel-Lucian",middleName:null,surname:"Radu",fullName:"Gabriel-Lucian Radu",slug:"gabriel-lucian-radu"},{id:"108318",title:"Dr.",name:"Eugenia D.",middleName:null,surname:"Teodor",fullName:"Eugenia D. Teodor",slug:"eugenia-d.-teodor"},{id:"108323",title:"Dr.",name:"Georgiana-Ileana",middleName:null,surname:"Badea",fullName:"Georgiana-Ileana Badea",slug:"georgiana-ileana-badea"},{id:"136337",title:"Ms.",name:"Andreia",middleName:null,surname:"Tache",fullName:"Andreia Tache",slug:"andreia-tache"}]},{id:"36184",title:"Infrared Spectroscopy in the Analysis of Building and Construction Materials",slug:"infrared-spectroscopy-of-cementitious-materials",signatures:"Lucia Fernández-Carrasco, D. Torrens-Martín, L.M. Morales and Sagrario Martínez-Ramírez",authors:[{id:"107401",title:"Dr.",name:"Lucia J",middleName:null,surname:"Fernández",fullName:"Lucia J Fernández",slug:"lucia-j-fernandez"}]},{id:"36185",title:"Infrared Spectroscopy Techniques in the Characterization of SOFC Functional Ceramics",slug:"infrared-spectroscopy-techniques-in-the-characterization-of-sofc-functional-ceramics",signatures:"Daniel A. Macedo, Moisés R. Cesário, Graziele L. Souza, Beatriz Cela, Carlos A. Paskocimas, Antonio E. Martinelli, Dulce M. A. Melo and Rubens M. 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Sheregii",authors:[{id:"102655",title:"Prof.",name:"Eugen",middleName:null,surname:"Sheregii",fullName:"Eugen Sheregii",slug:"eugen-sheregii"}]},{id:"36191",title:"Effective Reaction Monitoring of Intermediates by ATR-IR Spectroscopy Utilizing Fibre Optic Probes",slug:"effective-reaction-monitoring-of-intermediates-by-atr-ir-spectroscopy-utilizing-fibre-optic-probes",signatures:"Daniel Lumpi and Christian Braunshier",authors:[{id:"109019",title:"Dr.",name:"Christian",middleName:null,surname:"Braunshier",fullName:"Christian Braunshier",slug:"christian-braunshier"},{id:"111798",title:"MSc.",name:"Daniel",middleName:null,surname:"Lumpi",fullName:"Daniel Lumpi",slug:"daniel-lumpi"}]}]}]},onlineFirst:{chapter:{type:"chapter",id:"67400",title:"Measuring Infrastructure Skills Productivity",doi:"10.5772/intechopen.85953",slug:"measuring-infrastructure-skills-productivity",body:'\nProductivity in its broader sense is the association between a given output and the resources used to produce it; this relationship represents the global productivity factors, expressed as a fraction, of which the numerator is a measure of output and the denominator a measure of all factors combined. The combination of the factors of production (capital, labour, raw materials and power) is always heterogeneous, and values must be introduced to find an expression for it [1]. It is easier to relate output to a single factor than to a combination of factors. Labour is the factor considered in most cases, but it may be capital or a given raw material, for example.
\nProductivity is defined by the Concise Oxford English Dictionary “as the effective power of production and the proportion which goods are produced”. In this definition, it can be deliberated that the main resource in productivity is the workforce.
\nConstruction operatives are the most productive resource; therefore, productivity in the construction industry is dependent primarily on human performance and effort [2]. Construction labour productivity is an important productivity index due to the numerous human labour required to carry out and complete a task. Researchers in the field of economists will agree on the significant of productivity to an industry, an individual enterprise or the national economy; however, there has not been any agreement on the actual measurement techniques of productivity.
\nThe Bureau of Labor Statistics (BLS) updated the productivity measures for four infrastructure construction industries in 2017. These industries were only recently published due to difficulties in measuring worked hours and output [3]. The US construction sector in 2017 contributed a large portion to the economy with 4.3% of GDP and 6.1% of all industry employment which was attributable to the sector. Recently, the BLS noted that the infrastructure industries comprise about 10.5% of the entire industry sector’s employment.
\nThere have been several construction labour productivity (CLP) definitions that point towards the various perception of the productivity in the construction industry. The European Association of National Productivity Centres [4] defined productivity “as how resourcefully and efficiently goods and services are being formed, efficiently in this setting be doing things right or utilizing resources to achieve anticipated results”. Productivity is also defined by the American Association of Cost Engineers [5] “as a labour efficiency of relative measure, either bad or good when related to a recognised base or norm.” “The comparative nature of construction productivity generate most challenges in tracing it as a complete significant over time, it is feasible to gather information on the arrangement of the recognised base, or yardstick” [6]. However, the professionals in the construction industry and project managers defined labour productivity as a proportion of expected over actual productivity; this is mathematically expressed as
\nWhen a PR is higher than the unity, it means that the daily-based quantities require more work hours than the normal average day baseline; also, it implied that the productivity of that day was worse than the baseline productivity [6]. The importance of this method is that progress is based on the constructed work and not the hour work utilised and productivity can be measured despite the type of work done. The Bureau of Labor Statistics [7] well defined labour productivity as productivity per real worked hours, and these hours refer to the really worked hours, and this quantity discounts holidays, trip and sick leave; nevertheless, it comprises salaried and voluntary overtime.
\nProductivity measures how capitals are hired efficiently; it is defined “as the quantity of a specific amount of input per unit of labour to a specific measure of output and usually measured as total output divided by the numbers of units of labour employed to produce that output” [8]. Labour productivity in the construction industry can be described as the man-hour output per day, which is often reduced by poor provision of inadequate tools and equipment; delayed, unclear or inadequate instructions; unbalanced work gangs; wrong working method; inadequate incentives; and non-delegation of authority from senior supervisors to lower supervisors.
\nProductivity definitions seem to be dependent on the context and the researcher’s opinion on the study. Previous studies on engineering, technology and economics classified productivity into three broad industry groups; these various groups defined productivity from their various viewpoints [9].
\nDefinitions of productivity are aimed at explaining the meaning of the term, while measured descriptions in the previous case are used as a base of measurement; the main objective is to increase and productivity [10].
\nFrom the above background, productivity can be defined as the volume correlation relating to work hour utilisation and production. It is also the correlation relating to amounts of input hours used by an organisation to produce output:
\nFrom Eq. 2, output can be described as any process of the outcome, either a product or service, whereas input work hour consists of the hours utilised in a process. However, the relationship between a variety of output components and work hour is very complex. Measurement of construction skills productivity presents practitioners and academics with a variety of challenges.
\nSeveral challenges have been recognised by diverse researchers for declining labour productivity under the classifications of incomplete documentation, design changes, supply chain fragmentation and inefficient project management as the most important drivers affecting productivity in the mid-rise private development in Australia [11]. Ugulu and Allen [12] carried out an experimental examination on the importance of on-site craft gangs’ learning productivity and found an average improvement of learning rate of 94.21% gains as illustrated in \nTable 3\n. The study additionally discovered that on-site learning is a huge factor influencing productivity of construction craft gangs. In a related study, Tanko et al. [13] developed a framework for value management (VM) implementation, exploring the current construction practice factors that will improve construction productivity, the study found that people, environment, government and information are important factors that can be used by construction stakeholders to improve construction productivity practices in the Nigerian construction industry.
\nAn investigation on productivity of panelised and long span timber construction using time lapse photography on five active case study construction sites to measure installation productivity was conducted by Forsythe, Brisland [14], using net crane time as the basis for measuring productivity, being the time dedicated purely to crane cycles involved directly in installing prefabricated timber panels; 521 cycles were measured relating to the installation of 5592 m2 of panels. The study found that panelised prefabricated timber construction offers a fast and productive site installation process [14].
\nLabour productivity measurement in the construction industry is a difficult task; in most cases labour productivity is usually taken to mean productivity. This stems from the fact that projects in the construction industry are labour-intensive using basic equipment [15]. Productivity described the quantification of how well operatives use available resources to produce outputs from inputs [15]. The American Association of Cost Engineers [5] described productivity as when associated with standard or to a recognised base as the relative measure of labour efficiency is either good or bad.
\nThe BLS [3] opined that the increase in labour productivity during the 2000–2005 period was primarily driven by a large rise in output. Beginning in 2005, output fell through 2009 at a speedy rate than the worked hours, leading to a sharp reduction in productivity of labour during that period. The productivity of labour increased since 2009; however, in 2017 it is far below its 2005 topmost as presented in \nFigure 1\n. productivity of labour for single-family residential infrastructure (NAICS 236115x). The report further stated that infrastructure industry experienced a decrease in productivity output and a slight fall in worked hours, resulting to decreasing productivity of labour until 2010. In 2010, the productivity output returns to normal until 2017, when output slightly declined [3].
\nProductivity of labour for single-family residential infrastructure [1].
Construction skills productivity measurement is complex and challenging when comparing productivity in the construction industry between nations [16]. Productivity indices are utilised to adjust input and output information with the goal that efficiency measurement can be differentiated after some time and among industry divisions, and countries found that these lists vary among nations [17]. For instance, output in the construction industry is complicated when compared and quantified within a nation due to complexity in comparing single-family households to transportations, colleges to bridges or clothes centres to workplace buildings.
\nThe National Research Council [18] noted that worldwide productivity evaluations have similar encounters, such as the heterogeneity of inputs and outputs. The loss of valued information on the nature of heterogeneous building construction output is as a result of combining data to an organisational level [17]. In addition, [18] noted that “an industry productivity analyst varies on whether productivity in the construction industry is decreasing or improving.” Productivity has been declining for over 30 years. However, some construction projects and construction tasks studies document investigated improved in their productivity in the US industry productivity analysis [18].
\nContractor’s labour performance measure is degraded by variability in building processes when the presence of variation with process of construction time can no longer be determined [19]. Construction variability inflates the construction duration and decreases the processes and the ability of the production network [20]. Rework flow in construction project is a significant cause of variability that causes procedures to be unpredictable [6]. However, in building projects, rework can be arising due to errors in construction exposed through official stage examinations or casual on-site observations. Additionally, another kind of rework is client-related rework, which is instigated by variations in project design, plan and scope by the client [21].
\nConstruction on-site is environmental dynamic and subjected to a high level of unpredictability and outside volatility that can be caused by constraints outside the project location, such as extreme conditions of weather, while internal variability can be caused by various sources of unstable motivation, workflows and quality issues causing rework [22]. Construction variability presence influences the possible increase in the production rate by improving bottleneck processes [19].
\nPrevious literatures in engineering management studies have revealed that the two major noteworthy instruments for controlling changeability work process are unpredictability caused by rework which can be limited using effective observing and quality review [23, 24]. Walsh and Sawhney [25] saw that workflow process levelling approaches deliver steady outstanding burdens for exchange of temporary workers and workflow process levelling in construction productivity can be connected in different courses.
\nBashford and Sawhney [26] carried out an investigation and observed that in the activity-based model, an equally spaced schedule is upheld for all activities. In order to tackle these problems of unnecessary rework and ineffective time, certain management techniques have been evolving which is known as “time and motion study” but are now termed work study [27].
\nShirowzhana [28] investigated the use of a Wi-Fi-based positioning and communicating system for indoor positioning with radio communication systems called the Voice Communication and Locating System (VCLS). The VCLS was integrated with BIM and GIS for enhancing labour productivity in the construction industry. The GIS and the BIM were used for displaying the positions of mobile devices for tracking the position of a worker in a proposed site. The study revealed that VCLS has the ability of tracking the estimated locations of workers in 3D environment and GIS and VCLS are valuable software that could improve the communication efficiency and quality of interaction on the infrastructure site.
\nThere are three major methods used in the measurement of time and motion study (work study) in construction productivity [29]:
Visual recording method
Physical recording method
Interview and questionnaire method
Visual account is a strategy utilised in observing the execution of specialists on destinations persistently, and it may be considered as a pioneer in the use of visual chronicle method for efficiency checking determinations [29]. Parker and Oglesby [30] saw that this procedure includes the utilisation of photography time-slip with the application of a camera concentrated on a work territory and a photo is taken at precise time interims extending from 2 to 8 minutes. This strategy has a few advantages over others giving right, enduring and unquestionable records that can be valuable to teach determination of construction claims and contract contradictions, assessing workforce skills performance and evaluating the productivity of construction methods. This technique is related with a few burdens, for example, creating distress between the labourers being continually watched, lacking inadequate coverage area and the prerequisite for various cameras on huge destinations.
\nAnother kind of visual recording approach is the utilisation of tape recording framework in estimating workforce abilities execution. It has related elements of a task yet catches all or most concurrent exercises considering less eyewitnesses nearby. One of the burdens of this strategy is discovered that the procedure is a costly technique; it requires taught watchers to be available on location to monitor and record the work finished by specialists. The rudimentary methodologies utilised in this execution are activity sampling, visiting the site every day and consistent observation. Sampling activity strategy is otherwise called sampling work [30].
\nActivity sampling technique can be portrayed as a sporadic recognition methodology that incorporates seeing a little degree of assignment events that is adequately tremendous to have a numerical consequence. Regardless, it includes an eyewitness who may stroll around the project site and record workforces’ events, it is used to pass on a gadget for describing how the pros commit their time on attempted site, and it is occasionally expected that work accomplished, or yield is identified with the measure of period spent on direct work [30]. Activity sampling technique has been used widely and tested by several researchers, and important results were presented in many technical articles; one of the main importance of the method is that several workers can be concurrently observed by an observer on site, while the main drawback accompanying this method is the assumption that the amount of direct time spent is related to the outputs [31].
\nAn investigation carried out on the US plant construction using an extensive analysis of the data collected by activity sampling established there was no relationship among the direct working time spent and the outputs. The investigation found that work sampling technique does not differ between actual and busy work and decided that direct labour cannot be used to estimate productivity [31].
\nAnother type of activity sampling technique is the daily visit technique which is also known as intermittent observation method that encompasses the observer collecting data from site visit on a day-to-day basis [32]. According to Naoum and Hackman [32], finished site work or construction is visually checked by the observer and, if appropriate, marked on drawings; this technique has numerous importance, and if building sites are in near closeness to one another, the viewer can screen numerous sites throughout the same day.
\nSignificance of this strategy is that it evades the turmoil joined by workforces being watched and checked and underpins in maintaining a decent relationship among the watcher and site labourers. The information assembled by this procedure relies upon the exactness and precision of the information given by the site specialists; the steady perception strategy can be isolated into perception by direct technique and work study technique.
\nDirect observation technique can also be described as a physical method of observation that consists of a researcher physically observing the site for the total duration of the operational day and the observer concentrating his devotion on a gang of skilled craft members and recording direct and contributory time spent on the work and the period that is not consumed at work such as late starts and early quits, attending to personal needs and breaks [33].
\nThis technique offers a correct data and is very advantageous in determining the time input distribution used to accomplish certain outputs. The major disadvantage of this method comprises dissatisfaction and mistrust between the workers or group being constantly monitored, which might cause incorrect or inflated productivity, and also, on big project sites, it might necessitate more than one observer to efficiently observe the tasks rendering this method expensive [34]. There are three parallel approaches to physical recording technique, namely, work study, method study and work measurement.
Work study
The term “work study” considers the parallel strategies of method study and work measurement, which by an efficient method of examination and enhancement try to get the most ideal utilisation of human and materials assets [27].
The work study strategy is another related procedure like the immediate perception technique; notwithstanding, it shifts in the season of checking by the watcher on location; this technique, perception identifies with the work grouping of the undertaking analysed (British standard glossary, BS 3138). Work study can be all around characterised as an association benefit dependent on those techniques; particularly work measurement and method study strategy contemplate what is utilised when exploring human work in all background, and this can prompt the precise examination of the considerable number of capitals and variables which aggravate the viability and economy of the condition being inspected, so as to impact improvement [32].
Work study bolsters the parallel method study and work measurement strategies, which is a methodical technique for acquiring the most ideal utilisation of material and HR. It is a standout among the most possibly helpful apparatuses of the management. Conventional men can accomplish extraordinary outcomes by limiting squandered exertion and time and setting an appropriate standard of execution.
Method study
Method study measures the adequacy of the strategy and work technique procured to convey frameworks of examination designed for the headway of efficiency measures and surroundings of working [35]. The aim of method study is to evaluate the best method of doing work in order to recommend the best efficient technique of production. Although the detailed analysis may become more complex, the basic procedure is summarised in \nFigure 2\n.
The initial approach to this method is to first select the type of work that will impact the overall productivity of the skills workforce. The factors to be considered during the selection are economic, technical or human. Economic factors can include “bottlenecks” that can influence other activities. For example, form working on reinforced concrete-framed buildings, the operations can involve lots of labour/plant or the transportation of materials through a long distance like excavation of long hauls and repetitive work like building. There are always technical issues, but these issues must be resolved by a consultant specialist [27].
Work measurement
A work measurement complements method study in order to derive the maximum benefits from a systematic study of work activities. While method study is related to the approach in which work is performed, work measurement is interested with the human resources involved in the job. Although work measurement and method study are interdependent, they cannot be separated from each other.
The mental approach of work study is primarily the application of common sense, and assessment of the expected time needed to carry out a specific task by work measurement, because of the special technique employed, is mainly the field of the trained and experienced expert. Nevertheless, a project manager must have an adequate understanding of the principle involved if he is to employ work study successfully. Since work measurement seeks to reveal the shortcomings of management and to show up the behaviour of workers, it is often met with resistance so that an understanding of human factors involved is important. It is worth noting that time study provides a record of a particular operation, and not a check on an individual’s performance [27]. The general procedure for work measurement is presented in \nFigure 3\n.
Work measurement can be carried out by the advanced method. Time study is the basic technique: Timing is usually performed with a watch unless the extremely accurate measurement is required, when devices such as the cine camera or portable tape machine may be used. The watch can be a good wrist or pocket type with a second hand, but a stopwatch is better and more convenient. The purpose of work study is to optimise productivity from the manpower and materials available, and since it is management’s responsibility to see that the best use is made of organisation resources, it is, therefore, building managers who must be convinced of the value of work measurement application on building operations [27].
Work measurement procedure
Work measurement includes structuring a progression of perception structures to incorporate pertinent undertaking data. Site information data is incorporated into the perception shape. Precedent: venture type, perception number, compelling beginning date, space limitation, assuming any, ordinary day by day working hours, and the site management level. Furthermore, a short depiction of the watched task, for example, the technique, divider type, adds up to floor zone, and the quantity of stories will likewise be incorporated into the form. At long last, the qualities of each watched exchange are featured as presented in \nTable 1\n: work measurement form. The fundamental motivation behind these structures is to reliably record the basic efficiency parameters of data sources and their related yields for the different aptitudes or exchanges and to reflect, to an expansive degree, the genuine conditions on destinations.
Method study procedure.
Work measurement procedure.
Work measurement data collection form | \n||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Firm: | \nStudy no.: | \nDate: | \n||||||||||
Gang no.: | \nStart time: | \n|||||||||||
No. of skilled: | \nNo. of unskilled: | \nFinish time: | \n||||||||||
No. of operators in gang: | \nTotal observed time: | \n|||||||||||
Contract duration: | \nWall thickness: | \n100 mm | \n\n | 150 mm | \n\n | |||||||
Type of building: | \nBungalow | \n\n | 225 mm | \n\n | Other | \n\n | ||||||
Storey building: | \n\n | Other | \n\n | Wall height: | \n0–1.5 m | \n\n | ||||||
No. of floors: | \n1.5–2.1 m | \n\n | 2.1–3.0 m | \n\n | ||||||||
Weather condition: | \nAbove 3.0 m | \n\n | ||||||||||
\n | Observer: | \n|||||||||||
\nElement description\n | \n\nR\n | \n\nWR\n | \n\nOT\n | \n\nBT\n | \n\nAL\n | \n\nST\n | \n\nRemark\n | \n|||||
Discharge/loading of material | \n\n | \n | \n | \n | \n | \n | \n | |||||
Mixing of mortar | \n\n | \n | \n | \n | \n | \n | \n | |||||
Laying of blocks | \n\n | \n | \n | \n | \n | \n | \n | |||||
Pointing | \n\n | \n | \n | \n | \n | \n | \n | |||||
Others (specify) | \n\n | \n | \n | \n | \n | \n | \n |
Typical work measurement form [2].
R, rating; WR, watch reading/cumulative; OT, observed time; AL, allowance; ST, standard time; BT, basic time.
\n\nTable 2\n presents a typical analysis of work measurement data using the simple linear regression technique to investigate the relationship between the cycle numbers of the repetitive productive work input. The dependent variable is the skills worker recorded observed time productivity. A significant level of 5% was used to determine the relationship between skills worker inputs and cycle numbers by substituting the recorded observed time into the linear regression model equation:
\nS/N | \nLN man-hours | \nLN cycle no. | \nC | \nD | \nE | \nF | \nG | \nH | \nI | \nJ | \nK | \nM | \nN | \nO | \n
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Y | \nX | \nXY | \nX2\n | \nY2\n | \nn∑XY | \n∑X∑Y | \nn∑X2\n | \n(∑x)2\n | \nH-I | \nF-G | \nβ = K/J | \nΒẋ | \nα = Ῡ-βẊ | \n|
1 | \n6.10 | \n— | \n0 | \n— | \n37.2100 | \n9579.295908 | \n9591.644112 | \n4209.966516 | \n3754.35602 | \n455.6104957 | \n−12.348204 | \n−0.0271 | \n−0.063871109 | \n6.08464 | \n
2 | \n6.04 | \n0.6931 | \n4.186324 | \n0.4804 | \n36.4816 | \n\n | \n | |||||||
3 | \n6.03 | \n1.1098 | \n6.692094 | \n1.2317 | \n36.3609 | \n\n | \n | |||||||
4 | \n6.01 | \n1.3862 | \n8.331062 | \n1.9216 | \n36.1201 | \n\n | \n | |||||||
5 | \n6.01 | \n1.6094 | \n9.672494 | \n2.5902 | \n36.1201 | \n\n | \n | |||||||
6 | \n6.03 | \n1.7917 | \n10.80395 | \n3.2102 | \n36.3609 | \n\n | \n | |||||||
7 | \n6.12 | \n1.9459 | \n11.90891 | \n3.7865 | \n37.4544 | \n\n | \n | |||||||
8 | \n6.04 | \n2.0794 | \n12.55958 | \n4.3239 | \n36.4816 | \n\n | \n | |||||||
9 | \n6.05 | \n2.1972 | \n13.29306 | \n4.8277 | \n36.6025 | \n\n | \n | |||||||
10 | \n6.02 | \n2.3025 | \n13.86105 | \n5.3015 | \n36.2404 | \n\n | \n | |||||||
11 | \n6.04 | \n2.3978 | \n14.48271 | \n5.7494 | \n36.4816 | \n\n | \n | |||||||
12 | \n6.03 | \n2.4849 | \n14.98395 | \n6.1747 | \n36.3609 | \n\n | \n | |||||||
13 | \n6.04 | \n2.5649 | \n15.492 | \n6.5787 | \n36.4816 | \n\n | \n | |||||||
14 | \n6.04 | \n2.6390 | \n15.93956 | \n6.9643 | \n36.4816 | \n\n | \n | |||||||
15 | \n6.00 | \n2.7080 | \n16.248 | \n7.3333 | \n36.0000 | \n\n | \n | |||||||
16 | \n6.01 | \n2.7725 | \n16.66273 | \n7.6868 | \n36.1201 | \n\n | \n | |||||||
17 | \n6.04 | \n2.8332 | \n17.11253 | \n8.0270 | \n36.4816 | \n\n | \n | |||||||
18 | \n5.98 | \n2.8903 | \n17.28399 | \n8.3538 | \n35.7604 | \n\n | \n | |||||||
19 | \n6.01 | \n2.9444 | \n17.69584 | \n8.6695 | \n36.1201 | \n\n | \n | |||||||
20 | \n5.98 | \n2.9957 | \n17.91429 | \n8.9742 | \n35.7604 | \n\n | \n | |||||||
21 | \n5.98 | \n3.0445 | \n18.20611 | \n9.2690 | \n35.7604 | \n\n | \n | |||||||
22 | \n5.99 | \n3.0918 | \n18.51988 | \n9.5592 | \n35.8801 | \n\n | \n | |||||||
23 | \n5.98 | \n3.1355 | \n18.75029 | \n9.8314 | \n35.7604 | \n\n | \n | |||||||
24 | \n5.98 | \n3.1781 | \n19.00504 | \n10.1003 | \n35.7604 | \n\n | \n | |||||||
25 | \n6.01 | \n3.2189 | \n19.34559 | \n10.3613 | \n36.1201 | \n\n | \n | |||||||
26 | \n5.98 | \n3.2581 | \n19.48344 | \n10.6152 | \n35.7604 | \n\n | \n | |||||||
\n∑\n | \n\n156.54\n | \n\n61.2728\n | \n\n368.4345\n | \n\n161.9218\n | \n\n942.5226\n | \n\n | \n | \n | \n | \n | \n | \n | \n | \n |
Regression model for skills productivity.
From the regression equation, α and β indicate the intercept and the slope of the linear regression model. The slope and the intercept are estimated; thus
\nwhere y are the man-hours and x are the cycle numbers.
\nIn the regression equation above, α and β were used to calculate the regression model for the skills productivity as presented in \nTable 2\n.
\nAs depicted in \nTable 2\n, the slope and the intercept were estimated; thus
\nIn order to measure the significant of the skills (blockwork) productivity, the authors employed the application of the learning curve theory utilising the straight-line unit model as presented in \nTable 3\n. The mathematical model for the straight-line learning curve is
\nS/N | \nLN man-hours | \nLN cycle no. | \nC | \nD | \nE | \nF | \nG | \nH | \nI | \nJ | \nK | \nL | \nM | \nO | \nP | \nQ | \n
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Y | \nX | \nXY | \nX2 | \nn∑XY | \n∑X∑Y | \nn∑X2 | \n(∑x)2 | \nE-F | \nG-H | \nβ = I/J | \nẎ | \nẊ | \nΒẋ | \nα = Ẏ-Βẋ | \nS = 2b*100 | \n|
1 | \n6.1000 | \n— | \n— | \n— | \n9579.2959 | \n9591.6441 | \n4209.9665 | \n3754.3560 | \n−12.3482 | \n455.6105 | \n\n−0.0271\n | \n6.0208 | \n2.3566 | \n−0.0639 | \n\n6.0846\n | \n\n98.1389\n | \n
2 | \n6.0400 | \n0.6931 | \n4.1863 | \n0.4804 | \n\n | \n | ||||||||||
3 | \n6.0300 | \n1.1098 | \n6.6921 | \n1.2317 | \n\n | \n | ||||||||||
4 | \n6.0100 | \n1.3862 | \n8.3311 | \n1.9216 | \n\n | \n | ||||||||||
5 | \n6.0100 | \n1.6094 | \n9.6725 | \n2.5902 | \n\n | \n | ||||||||||
6 | \n6.0300 | \n1.7917 | \n10.8040 | \n3.2102 | \n\n | \n | ||||||||||
7 | \n6.1200 | \n1.9459 | \n11.9089 | \n3.7865 | \n\n | \n | ||||||||||
8 | \n6.0400 | \n2.0794 | \n12.5596 | \n4.3239 | \n\n | \n | ||||||||||
9 | \n6.0500 | \n2.1972 | \n13.2931 | \n4.8277 | \n\n | \n | ||||||||||
10 | \n6.0200 | \n2.3025 | \n13.8611 | \n5.3015 | \n\n | \n | ||||||||||
11 | \n6.0400 | \n2.3978 | \n14.4827 | \n5.7494 | \n\n | \n | ||||||||||
12 | \n6.0300 | \n2.4849 | \n14.9839 | \n6.1747 | \n\n | \n | \n | \n | \n | \n | \n | \n | \n | \n | \n | \n |
13 | \n6.0400 | \n2.5649 | \n15.4920 | \n6.5787 | \n\n | \n | ||||||||||
14 | \n6.0400 | \n2.6390 | \n15.9396 | \n6.9643 | \n\n | \n | ||||||||||
15 | \n6.0000 | \n2.7080 | \n16.2480 | \n7.3333 | \n\n | \n | ||||||||||
16 | \n6.0100 | \n2.7725 | \n16.6627 | \n7.6868 | \n\n | \n | ||||||||||
17 | \n6.0400 | \n2.8332 | \n17.1125 | \n8.0270 | \n\n | \n | ||||||||||
18 | \n5.9800 | \n2.8903 | \n17.2840 | \n8.3538 | \n\n | \n | ||||||||||
19 | \n6.0100 | \n2.9444 | \n17.6958 | \n8.6695 | \n\n | \n | ||||||||||
20 | \n5.9800 | \n2.9957 | \n17.9143 | \n8.9742 | \n\n | \n | ||||||||||
21 | \n5.9800 | \n3.0445 | \n18.2061 | \n9.2690 | \n\n | \n | ||||||||||
22 | \n5.9900 | \n3.0918 | \n18.5199 | \n9.5592 | \n\n | \n | ||||||||||
23 | \n5.9800 | \n3.1355 | \n18.7503 | \n9.8314 | \n\n | \n | ||||||||||
24 | \n5.9800 | \n3.1781 | \n19.0050 | \n10.1003 | \n\n | \n | ||||||||||
25 | \n6.0100 | \n3.2189 | \n19.3456 | \n10.3613 | \n\n | \n | ||||||||||
26 | \n5.9800 | \n3.2581 | \n19.4834 | \n10.6152 | \n\n | \n | ||||||||||
\n∑\n | \n156.5400 | \n61.2728 | \n368.4345 | \n161.9218 | \n\n | \n | \n | \n | \n | \n | \n | \n | \n | \n | \n | \n |
where y = cost and man-hours; T1 = cost, man-hours or time necessary to perform the first unit; x = cycle number of the unit; and b = slope of the learning curve, which is calculated as
\nwhere S is the learning rate, which is defined as the percentage reduction in the unit input, i.e. cost, man-hours or time, as a result of doubling the number of units completed. Eq. 8 can be rewritten as
\nQuestionnaire and interview techniques involve collection of information through interviews from workers and supervisors in the construction industry [36]. The two types of surveys that are mainly used by observers are:
The craftsmen’s questionnaire survey
The foreman delay survey
The craftsmen’s questionnaire
The craftsmen’s questionnaire survey is an intermittent perception strategy that is utilised for assessing the management productivity and to recognise difficulties impacting skilled workers’ output and motivation. This procedure includes a normal premise; the labourers are asked to give a guess of the loss of time on site, rank the seriousness of the difficulties and prescribe system to these difficulties, and therefore, managers would have the capacity to distinguish difficulties activated by deferrals and their plausible administrative suggestions to these difficulties. This strategy produces work joy and inspiration between the specialists as it communicates the feeling of association in the enhancement of the job instead of being only a device for its achievement [37].
The inconvenience of this system is because information gathered together are normally founded on the labourer’s memories and estimates as opposed to correct and point-by-point ongoing data.
Shortcoming originates from the measurement that workforces are not in a site to quantitatively perceive the reasons of general delays as they are not regarding the organisation, which lessens the individual technique and inclined to incorrectness, and work may likewise be irritated when workforces are named upon to fill the forms in classification for namelessness purposes; also, the methodology ends up being troublesome and dreary when every representative needs to fill a form.
The investigation conducted by Chang and Borcherding [37] recommended a new method which is related to the activity sampling method. In this method workers are selected randomly and are requested to fill the questionnaire form based on their utmost current events; this technique leads to better-quality accurateness and abridged work interruption as workforces are near to the observer at their various areas of work to complete the surveys form on the spot.
The foreman delay survey
The basic principle of the foreman delay survey method is to assist foremen, being closer to their work in order to determine and calculate the losses due to time at the close of each day at work with acceptable correctness [38]. This technique involves the foremen being requested to fill a list for day-to-day delay account in the project site, and the obtained information is measured, and a summary of time lost is shown stipulating all the stages of site supervision, together with the foremen who contributed to the data.
This method generates job happiness and motivation for foremen and their teams as they increase in value the fact that their decisions are respected by site management. Furthermore, the foreman delay surveys do not consider the availability of data on the efficiency of work approaches in a job and the capability of the labour force or the level of productivity attained; also, it offers a reasonably priced technique of finding input times activities.
Previous researchers [12, 14, 39] on improving infrastructure productivity observed that infrastructure productivity can be improved through any of the following:
Effective supervision and monitoring
Material management and supply chain management
Project front-end planning (loading) and work face planning
Training/learning and certification of workforce
Labour management and relations
Effective supervision and monitoring
In effective supervision and leadership area of improving construction productivity, professionals in the construction industry should adhere to the following:
Ratio of labour to supervision of 1–8 to 1–20. Should not exceed 20
Oversight with experience and authority
More formal process to enforce company failures
Accountability of scope, time and cost
Availability of all materials for construction
Material management and supply chain management
Material management and supply chain managers should ensure the following:
Ensure that all materials are available in a timely manner.
“Look ahead” material management and logistic plans.
Provide more resources, for example, material availability, land surveyors, construction supervisors and contractors.
Provide the right materials at the right time and ensure accountability.
Build relationships with suppliers.
Implement material management and controls in advance.
Project front-end planning (loading) and work face planning
Front-end planning is the method of developing enough strategic information which the project team can address the scope of the project and requirements that allow successful execution of the project, defining long-term plan, objectives and scope rather than jumping into design and quick construction.
If long-term goals and planning are more concretely defined, rework can be limited. Define scope of project and reduce conflicting scopes.
Plan projects in detail before starting.
Training/learning and certification of workforce
Training programs for both foreign and local labour help companies improve productivity in the following ways:
Encourage more organisational training for lower-level supervisors who are directly responsible for people on the tools.
Provide training and mentoring for frontline supervision.
Provide training for project management field/plant personnel.
Ensure proper training on the job to infrastructure worker to enhance experience.
Infrastructure trades promotion versus office/clerical alternative education.
If resource from other countries is used, then foreman must speak the same language.
Investing in apprentice training is necessary.
Provision of proper programs for mentorship will improve both work performance and training effectiveness.
Labour management and relations can be improved through:
Better relationship with workers because when management treat workers better, they perform better.
Provide attractive incentives, education and skilled labourer retention.
Foster a productivity culture productivity with an aim to get above 65%.
This chapter featured the systems utilised in measuring productivity in the construction industry. There are three noteworthy techniques that are possible for measuring construction skills productivity. The first identifies visual recording strategy that includes the use of consistent record of the labourer execution output on sites. The second is the physical recording procedure which includes an immediate surveillance system that incorporates a qualified onlooker really watching the site for the full length of the working day; the eyewitness or observer concentration is on a group of skilled workers who record the time spent on direct work. On enormous sites, more than one onlooker might be expected to productively watch the task of work utilising work study, method study or work measurement. The third measuring system is the utilisation of surveys and interviews which include data assembling through a meeting from supervisors and workers working in the construction industry. Finally, the chapter concluded that infrastructure productivity can be improved through effective supervision, material management and supply chain management, project front-end planning (loading) and work face planning, training and certification of workforce and labour management and relations. The above different strategies featured and talked about with illustrations are utilised in the measurement of infrastructure skills productivity.
\nThe authors declare that there is no conflict of interest.
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