An integrated approach for criticality prediction

The paper provides insight in techniques for criticality prediction as they are applied within the development of Alcatel 1000 S12 switching software. The primary goal is to identify critical components and to make failure predictions as early as possible during the life cycle and hence reduce managerial risk combined with too early or too late release. The approach is integrated in the development process and starts with complexity based criticality prediction of modules. Modules identified as overly complex are given additional tests or review efforts. Release time prediction and field performance prediction are both based on tailored ENHPP reliability models. For the complete approach of criticality prediction, recent data from the development of a switching system with around 2 MLOC is provided. The switching system is currently in operational use, thus allowing for validation and tuning of the prediction models