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A design review is a milestone within a product development process whereby a design is evaluated against its requirements in order to verify the outcomes of previous activities and identify issues before committing to - and if need to be re-prioritise - further work. The ultimate design review, if successful, therefore triggers the product launch or product release.
By definition, a review must include persons who are external to the design team.
Contents of a design review 
In order to evaluate a design against its requirements, a number of means may be considered, such as:
- Physical tests.
- Engineering simulations.
- Examinations (Walk-through).
Timing of design reviews 
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 an 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.
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