First Time Right
Quite often there is a re-design already planned as integral part of a new product design. This is good practice and realistic to have this possible delay in mind. However, the cost of it is huge. Not only the manpower that need to be invested for doing the re-design, also the manufacturing cost takes away from your budget. The biggest problem of a re-design is time-to-market that is lost due to one additional design cycle. It is good if the re-design cycle is included in the project planning – it is better if it is not needed!
To pay for a single re-design, due to a signal integrity fail that could have been found already in a pre-design study, is much more expensive than the cost of many studies. And the added value of pre-design studies is a deep understanding for the design.