<Li> Physical tests . </Li> <Li> Engineering simulations . </Li> <Li> Examinations (Walk - through). </Li> <P> Most formalised systems engineering processes recognise that the cost of correcting a fault increases as it progresses through the development process . Additional effort spent in the early stages of development to discover and correct errors is therefore likely to be worthwhile . Design reviews are example of such an effort . Therefore, a number of design reviews may be carried out, for example to evaluate the design against different sets of criteria (consistency, usability, ease of localisation, environmental) or during various stages of the design process . </P>

When should an enhanced design review be conducted