
Measuring External Product Attributes ◾ 471
and security with debate continuing about what other components of qual-
ity may be important. However, users and developers can agree among
themselves how to measure a particular attribute that interests them.
Normally, this measurement involves decomposing an attribute into mea-
surable components, sometimes guided by published quality models or
standards. e models make specic assumptions about relationships
among attributes. Although it is relatively easy to compute measures using
models, the measures are heavily dependent on subjective assessments.
A dierent but popular view equates qual