Zusammenfassung
An analysis is presented of early design and code change data from
the software cost reduction (SCR) project, a well-reported effort
conducted at the US Naval Research Laboratory from 1978 to 1988. The
analyses are mostly time-based studies of the change data and
relationships between the data and SCR personnel activity data. Some
analyses of the change data show patterns consistent with a major goal
of the SCR project: the design and development of easy-to-change
software. Specifically, most changes took a day or less to uncover and
resolve; the majority of changes updated at most one module. Moreover,
these percentages remained fairly stable. No positive relationship
appeared between error-correction effort and the number of days that an
error remained in the SCR design documentation. Other analyses suggest
that consistency may have been temporary. For example, the analyses
suggest a stepwise growth in average change effort, and an increasing
percentage of changes resulted in module interface updates. Certain
specific ratios between SCR change data and personnel activity data may
be possible indicators of design incompleteness
Nutzer