These organizations
had not compared notes, yet they came within 20 percent of one another. While
268 n Interpreting the CMMI
you may want much closer ranges, these data proved useful in initial quantitative
management of the maintenance projects.
Select the Process Performance Model(s)
to be Used by the Project
Once you have selected the project??™s goals, measures, subprocesses, and PPBs, you
can select the PPMs to use on your project. These may include:
Schedule and Cost Models
Progress Models
Reliability Models
Defect Models (defect identification and removal rates, defect removal effectiveness,
latent defect estimation)
Productivity Models
You will need to calibrate the models to match your project??™s performance. For
example, your project will have its own defect and identification and removal rates
that may be different from what is in the defect model. Be sure you understand the
basis of the models before you do any calibration.
Manage the Project Quantitatively
The project can now use the PPBs and PPMs to manage process performance and to
work toward achieving the organization??™s and projects??™ goals.
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