On modelling payments in projects

On modelling payments in projects

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Article ID: iaor1999627
Country: United Kingdom
Volume: 48
Issue: 9
Start Page Number: 906
End Page Number: 918
Publication Date: Sep 1997
Journal: Journal of the Operational Research Society
Authors: ,
Keywords: financial
Abstract:

Projects are often evaluated on financial performance. The net present value (NPV) has long been established as a highly relevant criterion in the management and control of projects. Research in this area has emphasised scheduling of activities in projects to maximise the contractor's NPV assuming that cash flows (both positive and negative) that occur over the duration of the project are known. In practice, however, the contractor usually knows the expenses associated with project activities. He can use this information combined with the knowledge of other project parameters such as activity durations to negotiate the payments received for completed work so that the project achieves the maximum level of financial returns. Extending previous research, this paper examines the problem of simultaneously determining the amount, location and timing of progress payments. We present several models and their solutions for an example problem. Based on the assumptions made, the models are applicable in different project environments. The problem and models presented here can be used by the contractor and client for managing cash flow, setting milestones, and negotiating critical contract parameters, in addition to identifying the location, timing, and amount of progress payments. They also contribute to the body of research on formulating and solving difficult combinatorial optimisation problems.

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