Despite knowing how important pursuing the correct KPIs  is to a business, I completely failed to apply the same lessons to myself and saw a big drop in my general usefulness as a result.
I started a new project recently on a familiar stack. I knew the steps involved and began turning my to-dos into to-dones. I was juggling freelance and some personal stuff, so my top priority was being efficient with my limited hobby project time.
Time was the contraint, so tasks completed per pomodoro  was the KPI.
I later downshifted my freelancing, removing the time constraint. My circumstances had changed and the efficiency metric was outdated.
Last week I caught myself stalling for hours. I was waiting to feel maximally focused before starting any work, as if trying to make the most of only one or two available project hours.
I’ve since changed my self-evaluation to be based on how much more fun the project is to play with at the end of each day. If I get there by putting in 8 half-assed hours, that’s okay. Progress-per-day is a better fit for my current goals and contraints than tasks-per-hour and I’ve been seeing good results.
From watching my own businesses (and life), the constraints and circumstances change far more frequently than I recognise and adjust for. And I’m noticeably less effective when it happens.
 KPIs are key performance indicators, which are the 3-5 Most Important Numbers about your business. Choosing (and maintaining) the right KPIs is a big part of a founding CEO’s job and choosing the wrong ones can completely de-rail a company’s focus (like focusing on visitors when revenue or retention or sales pipeline is more relevant).
 Pomodoro is a productivity system where you maintain total focus for 25 minutes (don’t answer the phone, no twitter alerts, no chat messages, no bathroom or coffee breaks) followed by 5 minutes away from the computer and then repeat. Every 4 blocks you take a longer 20-ish minute break to check email, get food, etc. It’s named after those little tomato kitchen timers.