Rules and tools for software evolution planning and management.

This paper develops the eight laws of software evolution (as defined at the time of writing) and supplements them based on the software uncertainty principle and the FEAST (Feedback, Evolution And Software Technology) hypothesis. The paper develops some fifty rules for application in software system process planning and management and indicates tools available or that could usefully be developed to support their application. The listing is structured according to the laws that encapsulate the observed phenomena and that lead to the recommendations. This paper thus represents a milestone in the field and has influenced much of what has followed.