The HTSM (v.5.7.5) is a set of guideword heuristics designed to help you think better about test strategy. It includes four focus areas: test techniques, project elements, product elements, and quality criteria categories. You can use it casually or rigorously. It is pretty generic to any kind of software. I’d encourage you to modify this to fit the context of your own organization.
Heuristic Test Strategy Model
New in 5.7.5: Added "Have you negotiated project conditions that affect your ability to accept your mission?" to the Mission section of the Project Environment page. From a suggestion by Ralph Fisher, during the RSTE3 Online class.