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Title: An investigation of effort distribution among development phases: A four-stage progressive software cost estimation model
Authors: Papatheocharous, Efi 
Bibi, Stamatia 
Stamelos, Ioannis 
Andreou, Andreas S. 
Major Field of Science: Natural Sciences
Field Category: Computer and Information Sciences
Keywords: Four-stage progressive model;Project management;Software cost estimation
Issue Date: 21-Jun-2017
Source: Journal of Software: Evolution and Process, 2017, vol. 29, no. 10
Volume: 29
Issue: 10
Journal: Journal of Software: Evolution and Process 
Abstract: Software cost estimation is a key process in project management. Estimations in the initial project phases are made with a lot of uncertainty that influences estimation accuracy which typically increases as the project progresses in time. Project data collected during the various project phases can be used in a progressive time-dependent fashion to train software cost estimation models. Our motivation is to reduce uncertainty and increase confidence based on the understanding of patterns of effort distributions in development phases of real-world projects. In this work, we study effort distributions and suggest a four-stage progressive software cost estimation model, adjusting the initial effort estimates during the development life-cycle based on newly available data. Initial estimates are reviewed on the basis of the experience gained as development progresses and as new information becomes available. The proposed model provides an early, a post-planning, a post-specifications, and a post-design estimate, while it uses industrial data from the ISBSG (R10) dataset. The results reveal emerging patterns of effort distributions and indicate that the model provides effective estimations and exhibits high explanatory value. Contributions in lessons learned and practical implications are also provided.
ISSN: 2047-7473
DOI: 10.1002/smr.1881
Rights: © Wiley
Type: Article
Affiliation : Cyprus University of Technology 
University of Cyprus 
University of Western Macedonia 
Aristotle University of Thessaloniki 
Swedish Institute of Computer Science 
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