The PRINCE2 Quality theme describes three aspects of quality which the project management team must address.
Quality Planning means understanding what the customer requires and defining the acceptance criteria for the overall project, setting out a strategy for achieving this, defining the individual products of the project, and detailing the methods of showing that they meet acceptance criteria. This quality planning is documented in a Project Product Description, Quality Management Strategy and individual Product Descriptions.
PRINCE2 avoids any discussion of how a set of acceptance criteria can actually be developed in practice through processes of analysis and requirements engineering.
Quality Assurance refers to activities independent of the project management team which check that the project has systems in place for Quality Planning and Quality Control. The project team does not do Quality Assurance itself. (There is argument about this aspect of PRINCE2, of course, since even the word 'quality' tends to throw up differing opinions about what is meant. Some would say that a project team is fully responsible for quality assurance by adopting or modifying a system of processes, procedures tools and techniques to meet the need to demonstrate that a 'good' product is being produced. PRINCE2. It all depends what is meant by the term 'Quality Assurance').
Quality Control covers all the activities of checking the conformance of a product to its quality criteria, and also process improvement (more usually in practice associated with Quality Assurance - some practitioners may have to 'unlearn' some concepts to fit the PRINCE2 language). Two categories of quality control activities are described - In-process methods and Appraisal methods.
The theme also covers a Quality Review technique, describing a formal structure to a review process for quality control suited to documents. Other quality control techniques are, of course, available!
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