The difference is that the CMM is a way to communicate

capabilities, and ISO is a way to communicate the process.

They are not necessarily incompatible.

The Capability Maturity Model is a very specific way of

classifying an organization's software development methods.

In a certain way, it tells how the quality of its software

designs is likely to be repeated.

ISO-9000 procedures describe a (possibly) definite

development process but gives no indication of the likely

quality of the designs or whether multiple software efforts

are likely to produce software of similar quality.