Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A product design specification (PDS) is a statement of what a not-yet-designed product is intended to do. Its aim is to ensure that the subsequent design and development of a product meets the needs of the user. The PDS acts as an initial boundary in the development of products. The PDS is a specification of what is required but not the specification of the product itself. Describing the actual product is done in the technical specification, once the product has been designed. The difference is important since describing the product itself at the stage of creating a PDS, effectively constrains the range of alternatives that are considered during the design process. The distinction can be seen as the difference between "What is the product to do?" and "How will the product do it?"

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