Relationship between Labour Performance and Variability in Blockwork Workflow and Labour Productivity

Abstract

This paper examined the analysis of labour productivity data of block work activity from sixty one construction sites.  The construction work composed of ongoing single story buildings in the study area Abuja metropolis.  Data used for the study were obtained using daily method of data collection which has the advantage to capture both quantity and time inputs.  A total of 1127 observations were made for the blockwork activity. From these data, the study variables (cumulative productivity, baseline productivity, coefficient of variation and project waste index which is the performance) were computed.  The result showed that the coefficient of correlation between coefficient of labour productivity variability and performance index was formed to be 0.630** which is significant at 0.01 confidence level.  The coefficient of determination (R) was calculated to be 0.44.  This showed that 44% variation in crew performance is accounted for by variability in labour productivity.  It was recommended that construction project managers should reduce variability by adjusting labour inputs on site.

Key Words; Variability, Labour, Workflow, Performance, Productivity, Blockwork.