An integrated approach for requirement selection and scheduling in software release planning |
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Authors: | Chen Li Marjan van den Akker Sjaak Brinkkemper Guido Diepen |
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Affiliation: | (1) Information Systems Group, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;(2) Department of Information and Computing Sciences, Utrecht University, Utrecht, The Netherlands;(3) Paragon Decision Technology, Haarlem, The Netherlands |
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Abstract: | It is essential for product software companies to decide which requirements should be included in the next release and to
make an appropriate time plan of the development project. Compared to the extensive research done on requirement selection,
very little research has been performed on time scheduling. In this paper, we introduce two integer linear programming models
that integrate time scheduling into software release planning. Given the resource and precedence constraints, our first model
provides a schedule for developing the requirements such that the project duration is minimized. Our second model combines
requirement selection and scheduling, so that it not only maximizes revenues but also simultaneously calculates an on-time-delivery
project schedule. Since requirement dependencies are essential for scheduling the development process, we present a more detailed
analysis of these dependencies. Furthermore, we present two mechanisms that facilitate dynamic adaptation for over-estimation
or under-estimation of revenues or processing time, one of which includes the Scrum methodology. Finally, several simulations
based on real-life data are performed. The results of these simulations indicate that requirement dependency can significantly
influence the requirement selection and the corresponding project plan. Moreover, the model for combined requirement selection
and scheduling outperforms the sequential selection and scheduling approach in terms of efficiency and on-time delivery. |
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