A3 Thinking is a great way to diagnose problems and communicate an action plan in a concise and easy to communicate format that is (among others) appropriate for communicating with executive management.
Agile and Lean methods give us a framework for approaching complex problems where the best solution is not entirely predictable upfront.
The problem with the standard Lean Canvas and other formats I have commonly found is that they are not appropriate in all situations, particularly when communicating action plans to executive management. The idea of tracking important business goals with sticky notes does not lend itself well unless the executive management is already embracing the practice themselves.
Fortunately A3 Thinking is a great tool for communicating the agile approach to a variety of audiences that includes executive management. It communicates the problem, goals, objective measurement, and experiment in a concise and easy to understand format. The most important ingredient of an agile framework is its ability to communicate efficiently and its ability to couch efforts in the scientific method in order to take best advantage of continuous learning .
I created this A3 Thinking Template and it works great for me: A3ThinkingTemplate
Here also is the A3 Thinking Template in Google Doc format: GoogleDoc