In Chapter 10, There is an API For That!, we already had a preview on the concept of conversions and metrics. Gathering statistics about your mobile app usage matters, as it often is the only way to get feedback from your users. If we want to learn something about this feedback, it is important to realize that the quality of the statics you obtain is more important than the quantity. While it may be tempting to gather as much data as possible, the opposite is actually true. Focus on what really matters. Actionable metrics is what we want. Ash Maurya writes about this in his books Running Lean and Scaling Lean. He claims user growth is more important than your total user base, and he certainly has a point there.

Acquisition and engagement are important metric categories. Acquisition numbers tell you something about your app's downloads, the number...