The first time I experienced some kind of TMM was on the Eurostar conference four years ago. It was developed by swedish students (and called TIM) and the note that was held about it was very appreciated.
The concept is similar to the CMM-concept although it focus on testing (of course).
We do not use it on our company, but I have read it through and noticed that we are following the most of it anyway.
However, I do not have any material about this but there is a similar work (TMM) that has been performed in USA. Maybe you can collect something out of it from this web-site www.midwest-st-lab.com
I'm sorry about my use of abbreviations without its descriptions.
TIM (my own spell mistake: TMI) was mentioned by Björn in the first reply, like a model developed by swedish students, and published in the EUROSTAR Conference a few years ago. The concept is similar to the CMM-concept although it focus on testing.
TPI is "Test Process Improvement" and the concept is similar to TMM or TIM. At this time, I'm reading the book "Test Process Improvement: A Practical Step-By-Step Guide to Structured Testing" by Tim Koomen and Martin Pol (ISBN: 0201596245).
Others: some other model developed to test's maturity qualification.
I have had a look through some TMM documentation / presentations and i do have a bit of an issue..... to reach Nirvana (Level 5) quote "Automated tools are a primary part of the testing process" [T.C Staab Using SW-TMM to improve the testing process. Nov 2002]
But: through no fault of our own we use 3rd party tools in VB.net I have yet to encounter automated tools capable of scripting / recording Janus UI controls to a usable / efficient level. This would mean that because of our requirement to use these controls we can not reach TMM level 5
Why should a development tool choice stop our software from conforming to a testing standard?
I guess TMM is not for us [img]images/icons/frown.gif[/img]