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Chapter 1. Introduction Chapter 8 - Summary provides a summary of the thesis and presents future work possibilities. In this chapter we argue that the findings presented in the thesis can aid in building better evolution simulation models. The Appendix collates the data tables and provides an overview of the files on the companion DVD for this thesis which has the raw metric data extracted from software systems under investigation. 9
Chapter 2 Software Evolution How does software change over time? What constitutes normal change? Can we detect patterns of change that are abnormal and might be indicative of some fundamental issue in the way software is developed? These are the types of questions that research in the field of software evolution aims to answer, and our thesis makes a contribution towards this end. Over the last few decades research in this field has contributed qualitative laws [174] and insights into the nature and dynamics of this evolutionary process at various levels of granularity [41, 59, 65, 71, 85, 96, 100, 118, 127, 162, 171, 188, 194, 200, 284, 289, 289, 290, 292–294, 304]. In this chapter we present the background literature relevant for this thesis and provide motivation for our research goals. 2.1 Evolution Evolution describes a process of change that has been observed over a surprisingly wide range of natural and man-made entities. It spans significant temporal and spacial scales from seconds to epochs and from microscopic organisms to the electricity grids that power continents. The term evolution was originally popularised within the context of biology and captures the “process of change in the properties of populations of organisms or groups of such populations, over the course of generations” [84]. Biological evolution postulates that organisms have 10
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Chapter 8. Conclusions • We prese
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Appendix A Meta Data Collected for
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Appendix C Mapping between Metrics
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Chapter D. Metric Extraction Illust
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Appendix F Change Dynamics Data Fil
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References [1] S. Alam and P. Duger
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References Software. In Proceedings
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References [43] N. Chapin, J. Hale,
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References [68] M. Di Penta, L. Cer
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References [91] C. Gini. Measuremen
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References [115] I. Held. The Scien
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References [140] H. Kagdi, S. Yusuf
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References [164] M. Lanza, H. Gall,
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References [214] H. Olague, L. Etzk
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References [242] C. Roy, J. Cordy,
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References [266] G. Succi, W. Pedry
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References ECOOP Workshop on Quanti
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References [315] T. Zimmermann, V.
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