PDS Vs. Product Specification
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 does the product do?" and "How will the product do it?"
Read more about this topic: Product Design Specification
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“For man is not the creature and product of Mechanism; but, in a far truer sense, its creator and producer.”
—Thomas Carlyle (1795–1881)