Keyword Test development process model

Is there a model for a keyword test development process? What I am looking for is something that we can use to support the development of Regression Tests.  Some of the tests we have are very complex and others are very simple.  I would like to be able to show the steps and the timing involved in their development.  If there are process models, it would be great to show them to folks that are interested.

Thanks.

Terry Galey