Good Test Plan Development is a Team Effort

The Software Engineering Institute provides courses on the Capability Maturity Model (CMM), which is a methodology, used to develop and refine an organization's software development process. Since 1984, the SEISM has been identifying, developing, and advocating practices for designing high-quality software and protecting networked systems.

However, The Blog below in my opinion is excellent, outlining what a good process would be for the planning side of testing. It does an excellent job to incorporate the considerations that are needed to properly implement automated testing.

Test Planning Process