It is important that a multimedia product functions properly, conveys the right message and is suitable for the target audience.

A prototype is an initial version of a graphic. The prototype is tested to make sure it is fit for the audience and purpose. If there are any errors or problems, the prototype is improved and tested again. This goes on until the product is considered to be fully functional and suitable.
This process is known as prototyping and testing and is illustrated in the flow diagram above.
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