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Chapter 6. Change Dynamics
6. The set of classes that this class depends on (defined as l out (n) in
Chapter 4.
7. The set of different absolute count measures computed for the
class (see Table 4.4, Table 4.2, and Table 4.3).
If all of the above information is unchanged for a class in two versions
under comparison, then that class is considered an identical clone and
tagged as unchanged. Although it is possible that some distinctively
smaller subset of the measures (as well as meta data) will suffice to assess
weather a class has changed without significant loss of precision,
we adopt the more conservative approach for our analysis and use the
full set.
6.1.3 Identifying Modified, New and Deleted Classes
The set of classes in a given version is N v , and any given version v of a
software system has the following disjoint sets:
• The set of unchanged classes U v (compared to the previous release),
• The set of classes that have changed C v (compared to previous release),
and
• The set of classes that are newly added in this release A v .
Additionally, there also exists the following disjoint sets in a given version
v:
• The set of classes that are deleted in the next release D f v,
• The set of unchanged classes U f v in the next release, and
• The set of classes that are modified in the next release C f v.
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