document: Hypothesis-based concept assignment in software maintenance Software maintenance accounts for a significant proportion of the lifetime cost of a software system . Software comprehension is required in many parts of the maintenance process and is one of the most expensive activities . Many tools have been developed to help the maintainer reduce the time and cost of this task , but of the numerous tools and methods available one group has received relatively little attention : those using plausible reasoning to address the concept assignment problem . We present a concept assignment method for COBOL II : hypothesis-based concept assignment -LRB- HB-CA -RRB- . An implementation of a prototype tool is described , and results from a comprehensive evaluation using commercial COBOL II sources are summarised . In particular , we identify areas of a standard maintenance process where such methods would be appropriate , and discuss the potential cost savings that may result
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