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Level 5 addresses common causes of variation. So, for Level 4, an
organization needs data that are stable and consistent. The major preoccupation of
110 n Interpreting the CMMI
assessors when reviewing Level 4 is, ???Did this organization mix apples and oranges?
Are the data really accurate? Did this organization collect the right data and did
they collect the data right???? To get ???good??? data, an organization usually has to collect
data for several years, or at least through several projects and several life cycles
of the projects. And when you first begin collecting data, they will not be consistent
data.Measurement data are collected beginning with Level 2 in the staged representation,
and in most organizations, actually begin being collected at Level 1. The
problem is the data are not clean and consistent because the processes used on the
projects (where the data are collected and used) are not yet stable and consistent.
Data in and of themselves are not magical. They simply reflect what is going on in
the projects.


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