Answer:
When form does not follow function, bad design results. Envisaging practical difficulties when the product is designed for a certain function, is a very important aspect which is quite often ignored. Get your best critic to analyse your design before you accept it. A design should also be kept aside for a certain period of time for evaluation and analysis. When thorough testing and comparison with the existing/commercial design is performed, all identified problems can be resolved. What is more important is to have good literature study, prior design experience and suggestions from your peers which may help in better design development.
