The pragmatic approach tends to be associated with the greatest success but can fail the longevity test unless metrics are institutionalized after the immediate problem is solved. The optimistic approach has the greatest opportunity for long-term success but tends to suffer from a lack of urgency and a perception of low return on investment. The terms measure and metric are often used interchangeably, but to do so can cause problems. A metric is a composite of measures that yield systematic insight into the state of processes or products and drives appropriate action. It is possible to have many measurements but no metrics.
Measurement is the basis to create and maintain metrics.
Metrics are indicators of process or product qualities that are not directly measurable, and if not addressed by metrics, are subjective and intangible. Such an approach is misguided. Any measure is better than no measure, and any measure is good if it consistently leads to the right control action. This establishes the position, allows trends to be recognized, and permits goals to be set. Goals Goals define the purpose.