An example situation in which such a mapping is necessary is when defect data from a variety of projects is aggregated to build a quality model that relates some characteristics of
software development to resulting quality in terms of defects.
Our goal was to develop a unified defect categorization scheme that is
completely “backward compatible” with existing data, that
captures domain-specific elements of interest to NASA, and that
has other desirable attributes of good defect taxonomies
Performance is one of the key aspects of non-functional qualities, where performance bugs can cause significant performance degradation and lead to poor user experience.
A typical trajectory to becoming a core developer is to start communicating with other project contributors and then gradually get more involved, by earning a more central position in the project's social network.