
102 ◾ Software Metrics
EXAMPLE 3.8
AT&T used GQM to help determine which metrics were appropriate for
assessing their inspection process (Barnard and Price 1994). Their goals, with
the questions and metrics derived, are shown in Table 3.3.
What is not evident from the GQM tree or table is the model needed to
combine the measurements in a sensible way so that the questions can be
answered. For example, the tree in Figure 3.2 suggests measuring coder pro-
ductivity; this attribute may be measured in terms of eort per LOC, but that
relationship is not explicit in the tree. us, one or more models that express
the relationships among the metr ...