Measure What Matters is regarded as the definitive guide to implementing OKRs, drawing credibility from Doerr's direct lineage to Andy Grove at Intel and his role installing the system at Google. Teresa Torres and Melissa Perri both discuss OKRs as a foundational framework for aligning product work with business outcomes, while Eric Schmidt's Trillion Dollar Coach notes that Bill Campbell himself helped refine OKR discipline at Google alongside Doerr.
Not everyone is persuaded, however -- Marcus Buckingham and Ashley Goodall argue in Nine Lies About Work that cascading goals create false alignment and that meaning, not goal hierarchies, is what truly motivates teams. Readers find the book most useful for its real-world case studies and practical templates, though some wish it spent more time addressing what to do when OKRs go wrong.