Diátaxis, the framework behind most tutorial-writing advice, says an author must rely on users to discover flaws through extensive testing and observation, without specifying what that observation should produce. Google's own docs_advisor guide gets further, describing friction logging: writing down everything that trips a reader up. The output stays a qualitative note per session, never a register tied to a specific step number. Every other page for this query adds prerequisites, runnable code and a troubleshooting table, none of it fed by real reader data.
This pack's Failure Mode Log adds the register: which step a reader reported trouble at, and which step the investigation actually traced it to, because those are not always the same step. On the worked example, Corven Metrics, an invented event-tracking SDK, an 11-step tutorial drew 97 divergence reports across 640 reader sessions in its first 90 days, 71 sessions filing at least one. Two steps, 3 and 7, carried 63 of the 97, 64.9 percent.
29 of those reports were filed at Step 7, "nothing shows up on the dashboard," and 24 of the 29, 82.8 percent, traced back to Step 6, which returns a normal-looking success response while silently dropping the event. The fix landed on Step 6, not Step 7, and the following 90 days, at comparable traffic, saw the report rate fall 77.3 percent. Whether the tutorial's terms match your approved vocabulary is a separate pass, the terminology and glossary pack, and whether an existing page still matches the product a year later is the documentation audit.