Measure what matters by John Doerr

In 1999, legendary venture capitalist John Doerr invested nearly $12 million in a small startup that had amazing technology, entrepreneurial energy and sky-high ambitions, but no real business plan. After implementing Doerr's system of Objectives and Key Results (OKRs), the company grew exponentially. Today, that same startup - Google - has a market cap exceeding $600 billion