Outcomes Over Output: Why Customer Behavior Is the Key Metric for Business Success

Seiden's short book makes one argument clearly: the right measure of product success is not what you shipped (output) but what changed in customer behaviour (outcome). The book is deliberately concise — under a hundred pages — and that compression is its value. For product direction it is a useful pocket reference for the most common conversation in product organisations: the one where shipping features is confused with making progress. Read alongside Perri's Escaping the Build Trap for the longer treatment and Doerr's Measure What Matters for the goal-setting complement. Short enough to read in an afternoon, portable enough to carry into meetings.