Product management teams all face the challenge of estimating the market size of a feature, product, and/or offering. I've been asked many times for a template that captures the overall objectives of market sizing. I'm showing this template because it illustrates the most common factors, identifies some of the common challenges, and demonstrates the overall concepts used in market sizing. The first concept to grab is the top-down and bottom-up approaches, which both have their strengths and wea...