On goal setting framework which is wildly used globally in Google for example. John Doerr is an investor who truly know his sh*t. Included are great stories from different very well known brands such as Gates foundation, Bono and before mentioned Google.
Creator of OKR – Objective and Key Results.
I have myself used these with my teams to a great effect. Especially when you are in a pickle or stuck. Helps you focus on essential things.