Lots of great lessons here.
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Good detailed investor framework highlighted by X handle @SuccessProject_ Link
One can tweak this further based on your own learning curve and experience, but this is a good starting point
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The letter is the transcript + slides of a talk given by Yen to students around framework investing and the case study methodology. In this talk, Yen stresses the importance of frameworks for developing pattern recognition skills and identifying opportunities as the single most important area of their R&D, before sharing goals and lessons on maximizing return on time, learning quickly, studying compounders, identifying the right tail and dissecting the left tail, and understanding historical patterns to exploit them in the present. He then shares their case study methodology, starting with the goals of the methodology, the elements of a great case study, and a short mantra around the process, highlighting the importance of actually applying knowledge when it comes to investing. Next, he actually walks through a case study that was prepared as part of a Columbia Business School class, showcasing the depth of research conducted by sophisticated investors.