1. Ergonomics is concerned with the "fit" between people and their technological tools and environments2. When ease of use is an important criterion, industrial designers will need to ensure that the features of the product effectively communicate their function3. If the product needs to be serviced or repaired frequently, ease of maintenance is crucial4. In many cases, a more desirable solution is to eliminate the need for maintenance entirely5. The more interactions users have with the product, the more the product will depend on industrial design6. A doorknob typically requires only one interaction whereas a portable computer may require a dozen or more, all of which the industrial designer must understand in depth.7. A user interface requiring incremental improvements to an existing design will be relatively straightforward to design such as the buttons on the next generation desktop computer mouse8. The safety concerns in the design of a child's toy are much more prominent than those for a new computer home
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