TRIZ is a Russian acronym: теория решения изобретательских задач, or transliterated as: teoriya resheniya izobretatelskikh zadatch. It generally is translated as the Theory of Inventive Problem Solving. So, at times it has been called TIPS. But this makes it sound like just a bunch of suggestions, so real TRIZ people don’t like that name. By the way, it sounds like “trees”. Not like “tris”.
TRIZ was mostly developed by Genrich Altshuller during the mid-late 1900’s. The goal of TRIZ is make invention more of a science; more of a process. In fact, Altshuller developed what is called ARIZ, which is an algorithm for inventive problem solving!
Quite a lot of the core of TRIZ is around solving contradictions. Altshuller generally considered tools like brainstorming to be too divergent, and a waste of time. He wanted to get down to the solution fast, and reliably!
Some of the body of knowledge of TRIZ is not used so much. However, some of it is fundamental solving contradictions.
Altshuller also had an interesting life. I would recommend one his early books titled, “And Suddenly the Inventor Appeared”.