Lean Analytics: Use Data to Build a Better Startup Faster

Croll and Yoskovitz wrote the operational companion to Ries's theoretical argument in The Lean Startup. Where Ries argues that validated learning is the right unit of progress, Croll and Yoskovitz tell you which numbers to actually look at at each stage of a startup and what they mean. The "One Metric That Matters" framing is their most portable idea — at any given moment there is usually a single number whose movement contains most of what you need to know, and picking it forces the hard conversation about what you are actually trying to do. Read alongside Doerr for the goal-setting layer and Varian for the pricing mechanics. More useful than it is elegant.