A PDS does not just help the people who design and make the product. Those who eventually use it also benefit. Consumers' judgements are all too often overlooked by engineers, but people think critically about the products they buy. They may take an interest in design or engineering for its own sake. They certainly will not hesitate to criticise a product if it does not do, efficiently and reliably, what they expect it to. A PDS is therefore also an analysis of what the market will demand of the product. See reference 3.