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A product characteristic (PC) is an attribute of a product that describes the its ability to satisfy its purpose in a larger system. PCs describe what a product must be. They serve as labels by which to group other kinds of requirements.
PCs describe what a product ought to be, but not what the product ought to do. As such, PCs can almost always be described using adjectives and adjectival phrases. A PC is never phrased as a verb (that what a functional requirement is for).
At first glance, PCs might seem almost vacuous, contributing nearly nothing to the study of the design problem. However, this is not really the case. A common source of error in design is that the designers will forget to consider the impact of one or more PCs in their work. It is human nature: designers will tend to focus on issues that are of particular importance to them, and expect someone else to take care of other issues. Sometimes, some issues will “fall through the cracks” resulting in a poor design1).
If you think about it, there are some PCs that every designed intervention has. Because of this we can define a fundamental list of PCs that everything you design will be. The real questions are how and to what extent will your interventions exhibit these characteristics.
To simplify matters in this course, all teams must use only the following five product characteristics.
None of the questions above are binary - there are no “yes-or-no” answers. The answers to all these questions exist on a spectrum: any design can be ranked, at least relative to the reference design, on how much they are better or worse on each of these five PCs.
Focus on Functionality and Usability In one-semester design courses, it is very difficult to cover all necessary requirements for all five PCs. Since quality is more important than quantity in this course, make sure you have functionality and usability as well addressed as possible, even if that means neglecting the others somewhat.
There are many possible adjectives that could be PCs, but are not included in this list.