Write this BEFORE you need it. A tight investment thesis you can reference when the stock drops and you're tempted to panic sell. 2-sentence "why I own this," 3 things that must stay true for the thesis to hold, 3 things that would break it and trigger an exit, 12-month expectations, and a pre-committed response to a 20% drop tomorrow (buy more, hold, or sell — and why). Written in your voice, direct, no hedging.
Discovered on Twitter via @JasonL_Capital