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This paper explores the impacts associated with different software process models on the staff. The main research question addressed is whether any process model leads to a higher satisfaction of staff, and less human resource related problems, including staff turnover or increased stress levels. This issue is empirically investigated using a set of projects from 15 different software developing companies. Agile-oriented models are not necessarily limited to small projects, but both groups showed nearly identical distributions for team size and duration. Interestingly, rigid-type models tend to exhibit higher effort estimations, and lower correctness in these estimations.
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