The Effects of Productivity and Work Flow Variability on Construction Jobsite Labour Performance in Nigeria

 – The Effects of Productivity and Work Flow Variability on Construction Jobsite Labour Performance in Nigeria – 

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ABSTRACT  

The management of daily labour productivity variability on site is an important aspect of lean thinking. The lean construction technique suggests that reducing variability gives better labour performance. Therefore, this work examines the analysis of labour productivity data of four cement-based activities which are; block laying, concreting, wall plastering and tiling from two hundred and forty-four construction sites of single storey buildings in Abuja metropolis.

The objective was to determine the relationship between labour productivity variability and crew jobsite performance and also to identify the level of gap between the present performance of all the builders handling the sampled projects and expected benchmark performance. The daily method of productivity data collection was adopted in this research.

The data used were subjected to test for normality and found to be slightly normal with skewness values of 0.425, -0.247, 0.645 and 0.336 forblock laying, concrete activity, wall plastering and tiling work respectively. It was observed that the skewness value for concrete work was found to benegative which means that the distribution was negatively skewed while other results were positively skewed.

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INTRODUCTION  

The building construction industry in Nigeria is an important sector for employment and economic growth (Ogunsemi and Jagboro, 2006). The development of infrastructure in any nation contributes significantly to the gross capital formation, therefore the performance of the building construction firms (contractors) in this regard would be of utmost importance. Recent analysis of the Federal Government budget shows that construction expenditure accounts for about 50% of government spending (Eze, 2011).

As a consequence, any effort geared towards improvement in construction efficiency by means of increasing productivity would be a worthwhile venture (Kazie, 1987 cited in Ogunsemi and Jagboro, 2006). The foregoing assertion is corroborated by Hormer and Zakiel (1996) in their analysis that 10% increase in construction labour productivity will represent an enormous annual savings.

According to the Centre for the Study of Living Standard report (2008), the rate of labour productivity growth is thus the driving force behind improvement in per capital real incomes and seemingly small declines in productivity growth can accumulate into large differences in the pace of living standards improvement. 

Labour productivity has been identified as an index for measuring productivity because labour is acknowledged as the most important factor of production since it is the only factor that creates value and sets the general level of productivity (Ameh and Odusamu, 2002). 

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