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The data should be reasonably representative of the population that would use the item.
The design features must accommodate a broad spectrum of people.
When items are designed for specific groups, the data used should be specific for such groups.
3.1 Design For Extreme Individuals
3.1a Design For Maximum Population
3.1b Design For Minimum Population
3.2 Design For Adjustable Range
3.3 Design For The Average
