
A Goal-Based Framework for Software Measurement ◾ 97
at the trend in GNP over time, hoping that it will rise—that the country
is becoming more productive. The GNP is a weighted combination of the
values of key goods and services produced; the weights reect the priorities
and opinions of the economists dening the measure. The value of indi-
vidual goods and services can be measured directly, but the GNP itself is an
indirect measure.
In the same way that economists want to control the economy and make
a country more productive, we want to measure and control the quality of
our products, and we usually do so by measuring and controlling a ...