Introduction

Every idea has an opportunity cost. Working on ture a means your not building feature b. An effective product manager can sort out the great ideas from the merely good ones. The ideal experiment to validate our hypothesis would be to build the full product and see how our success metrics change. Sometimes this is the right thing to do, such as if your hypothesis is that fixing a bug or adding a small feature will help you achieve your goals. But often building the full product is a big investment in both time and cost.