Action Research is the foundation of all Agile/Lean methodologies around. The most famous use cases are Agile/Scrum in software development, After Action Review in the US Army and Principles by Ray Dalio.
Action Research is a generator of evolutionary processes. Instead of following any rigid outside process, you better develop your own one in a trial-and-error iterative way. That way you will get something much more effective for you personally.
This process is a practical guide to this methodology, not getting too deep into theoretical and technical details of the origin. Given that Action Research is a purely practical approach, I hope that it will be enough for you to get started.