Abstract: To improve the implementation effect of software quality assurance （SQA）and to ensure the successful of software projects, a quantitative and systemic method of quality assurance planning was studied when combined with some actual project cases. By collection and statistics of historical data, and also by the analysis of software complexity, the ratio of quality assurance effort to total effort of the project could be obtained. On base of the result, we provided software organizations with a good method on how to decide the effort of SQA. In addition, by such activities as participating in project planning, choosing SQA tasks and reviewing the SQA plan, we provided the process improvement of software organizations with a set of feasible methods on making software quality assurance plan. The actual data indicates that this method could ensure the effective planning of SQA.

Key words: software project, quality assurance planning, effort estimation, ration statistics