Use of software triggers to evaluate software process effectiveness and capture customer usage profiles

Summary form only given, as follows. We have analyzed fault data comprising nearly 30,000 records (including in-process and field data) from two real products A and B over multiple releases, using orthogonal defect classification (ODC). We exploit the information capture by ODC triggers to evaluate the development activities, and identify specific actions for improvement in development. We illustrate the use of triggers to capture customer usage in a way that is directly meaningful to product development and show: (i) the complete trigger profiles by the development activity for two releases of product A, and evaluate the effectiveness of product development activities; (ii) how systematically the appropriate trigger distribution during the development activities can be made to approach the trigger distribution in the field over six releases, as validated by /spl chi//sup 2/ tests; (iii) study the field defect trigger distributions for product A over three releases, and demonstrate the consistency of the profile over multiple releases and discuss the origin of differences; and (iv) compare the field trigger profiles of products A and B and discuss the differences in their customer usage and environment. This is the most comprehensive use of ODC triggers in development and field data reported to date.