
The “health” of a process is a spectrum. What we’re really interested in is the quality-of-service — such as how long it takes for a process to return the result of a given unit of work and the accuracy of the result.
… benefit of keeping the change I want in the system, which is often harder than making the change.
Contrast this with code metrics as an incentive: metrics distract from our collective goal of making this particular software great. They draw our attention to numbers, instead of customers. Metrics are great for information, but as soon as they’re used to alter the incentive landscape, they distort it in unintended ways.