ES4.4 Populations are always diverse.

The situations in which a technology will be used, the people who will use that technology, and the uses to which it will be put, are all more varied and diverse than one might first expect. It is better to develop the system with this variability in mind than to be surprised by it later. Students need to learn to consider issues such as culture, gender, ethnicity, age, and disability at the very beginning of every design process. They also need to consider the variety of situations and conditions under which a product will be used and the variety of purposes for which it might be used.