Planning a measurement program. What is a metrics plan?. A metrics plan must describe the who, what, where, when, how, and why of metrics. It begins with why , laying out the goals or objectives of the project.
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The GQM approach to process and metrics provides a structure from which managers and developers can derive a set of crucial project goals, plus the questions that must be answered in order to tell if the goals have been met.
Then, each question is analyzed in terms of what measurements are needed to help decide the answer to each question.
The GQM approach must be supplemented by one or more models that express the relationships among the metrics.
GQM could also be combined with process assessment frameworks like process maturity model (where an organization is rated on an ordinal scale from 1 (low) to 5 (high), based on 110 questionsabout its development process)
Table 13.1 lists the twelve questions required for a level 2 (repeatable) assessment; if any of these questions is answered "no", then the organization was automatically assessed at a level 1, regardless of the answers to the 98 other questions.
The metrics plan must address the people who perform each of these tasks on data: capturing, formatting, validating, analyzing, presenting, using (within the goals of the program), evaluating (effectiveness of the metrics plan).
Are the goals the same? If business goals changed, metrics program's goals may need to change
Are the priorities of the goals the same? As one improvement is successful, other may be chosen
Are the questions the same? Questions relevant for the first stages of metrics program (how much to invest in metrics tools) may be replaced by questions of maturation (how much money and time are saved)