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Designers will have written a design specification, developed from the design brief and based on the results of completed research. This is where a specific list of criteria is written that a designer can follow as a set of rules. During the iterative design process, this specification should be referenced to and designs evaluated against it to ensure the final solution is the best fit.

Considerations might include:

• How does the product fit within the range of sizes specified?
• Does the product fit the client’s taste?
• Do the materials and components fit within the specified cost limits?
• Does the product appeal to the target market?
• Will the design comply with current safety standards?
• Will the product have a minimal impact on the environment?

Evaluation is part of the iterative design process, a circular design process that models, evaluates and improves designs based on the results of testing.

The iterative design process works by analysing the feedback received and evaluating against the specification criteria to determine the effectiveness of the product and consequently to redevelop the product. Further improvements can be made and then more feedback can be gathered until both the client and the target market are happy with the outcome.

Without the iterative cycle of evaluation and improvement from both the client and the target market, the product may not be the best on the market. This will allow another manufacturer to produce a better product that will be more successful.