It is often the case with consumer products that demographics are used as screening criteria to select interview subjects, but even in this case, they should be serving as a proxy for a hypothesized behavior pattern.

• 对于消费类产品，人口统计学因素常常作为筛选访谈对象的指标。 即便在这种情况下，也应当把他们看做假设行为模式的代表。