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Boussabaine, A H and Elhag, T M S (1999) Applying fuzzy techniques to cash flow analysis. Construction Management and Economics, 17(06), 745-55.

Brooker, P (1999) Survey of construction lawyers' attitudes and practicein the use of ADR in contractors' disputes. Construction Management and Economics, 17(06), 757-65.

Bubshait, A A, Farooq, G, Jannadi, M O and Assaf, S A (1999) Quality practices in design organizations. Construction Management and Economics, 17(06), 799-809.

Eldin, N N (1999) Impact of employee, management, and process issues on constructability implementation. Construction Management and Economics, 17(06), 711-20.

Fraser, C (1999) A non-results-based effectiveness index for construction site managers. Construction Management and Economics, 17(06), 789-98.

Hanna, A S, Russell, J S and Vandenberg, P J (1999) The impact of change orders on mechanical construction labour efficiency. Construction Management and Economics, 17(06), 721-30.

  • Type: Journal Article
  • Keywords: change order; labour efficiency; mechanical contractor; productivity
  • ISBN/ISSN: 0144-6193
  • URL: https://doi.org/10.1080/014461999371060
  • Abstract:

    Change orders impact many areas of a construction project. However, the impacts that change orders have on labour efficiency are much harder to quantify than other impacts and therefore are a significant risk to contractors. Little research has been completed in the past quantifying these impacts, so disputes are common between owners and contractors regarding the actual cost of change. This study used data from 43 projects to develop a linear regression model that predicts the impact of change orders on labour efficiency. The input factors needed for the model are (1) total actual project hours, (2) total estimated change hours, (3) impact classification, and (4) timing of change. The model calculates the labour loss in efficiency for a particular project so that owners and contractors will better understand the true impact of change on labour efficiency. The research is limited to the mechanical trade, but does include specific work in plumbing, HVAC, process piping, and fire protection.

Leu, S-S and Yang, C-H (1999) A genetic-algorithm-based resource-constrained construction scheduling system. Construction Management and Economics, 17(06), 767-76.

Loosemore, M (1999) Responsibility, power and construction conflict. Construction Management and Economics, 17(06), 699-709.

Roy, R and Cochrane, S P (1999) Development of a customer focused strategy in speculative house building. Construction Management and Economics, 17(06), 777-87.

Yogeswaran, K and Kumaraswamy, M M (1999) To instruct or not? The engineer's dilemma. Construction Management and Economics, 17(06), 731-43.