On the Discourse of Measuring Work Flow Efficiency in Construction. A Detailed Work Sampling Method

Bo Terje Kalsaas1

1Dr.Ing, Associate Professor, Faculty of economics and social sciences, Department of working life and innovation, University of Agder, 4846 Grimstad, Norway, Phone +47 37 25 30 00, e-mail: bo.t.kalsaas@uia.no

Abstract

The purpose of this paper is to test out a detailed work sampling method in the operationalisation of workflow – as part of the discourse about workflow and waste. The paper is part of a wider, ongoing research project on flow in construction work, which has resulted in the identification of several alternative strategies for measuring workflow. The conceptualisation of workflow is based on the premise that it must integrate the two dimensions of uniformity (smoothness) and intensity (productivity). The method builds on an operationalisation of the factors involved in workflow which has its basis in Shingo’s well-know distinction between operation and process. Furthermore, the conceptualisation draws on the social methodology of critical realism in order to distinguish between different causes for good or bad flow. It also includes an understanding of waste as visible and observable, and as hidden in transformation work (direct work) and indirect work; and of what initiatives can be taken to reduce visible and hidden waste. An inductive approach is applied to operationalise operations in construction, and to the question of how this data based on work can be used to calculate workflow. The verification of the explored instrument or measurement model draws on data from different construction sites. Theoretically, the paper contributes to the Lean literature by conceptualising workflow and waste within a social scientific framework. Practically, it contributes by establishing detailed benchmark figures on the basis of different construction projects.

Keywords

Workflow, waste, operationalisation, work sampling, measurement

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Reference

Kalsaas, B.T. 2011, 'On the Discourse of Measuring Work Flow Efficiency in Construction. A Detailed Work Sampling Method' In:, Rooke, J. & Dave, B., 19th Annual Conference of the International Group for Lean Construction. Lima, Peru, 13-15 Jul 2011.

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