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Five-Point Ranking Scale
A prominent feature of CMM and CMMI was a five-point ranking
scale that evaluated the relative sophistication of the organizations
being studied. The original CMM scale had a distressingly high
number of companies that were not very sophisticated.
Table 7.2
shows the early distribution.
Table 7.2
Five Levels of the SEI Capability Maturity Model (CMM)
Circa 1990
The older assessment method developed by the author was
based on the IBM West Coast assessment approach. This method
also used a five-point scale but with very different meanings and
rankings.
Table 7.3
shows the assessment scale used by SPR since
1983.
Table 7.3
Five Levels of the SPR Excellence Scale
The two scales both attempted to capture software team capabil-
ities but used different numbering systems, which indeed ran in op-
posite directions. As the SEI assessments became popular, a math-
ematical conversion tool was developed by the author that could do
bidirectional conversions between the SEI and SPR scales. Anoth-
er estimating tool was developed that could show the time and ex-
pense from moving up the CMMI ladder from Level 1 to any high-
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