Content Gap Detection

Content Gap Detection is the sixth and final stage in the clustering pipeline, identifying missing topics by comparing a site's existing content against the complete topical map. It prioritizes gaps using the P1-P4 system: P1 (topic in >3 top 10 titles, critical), P2 (in PAA, high priority), P3 (in Related Searches, medium), P4 (in 1-2 titles, low). The result is a specific list of topics to write with priorities based on SERP data, not intuition. Content Gap Detection closes the clustering pipeline: from seed keyword through expansion, clustering, validation, CORE/OUTER mapping to the 'what to write next' list.

In practice, start with P1 and P2—these are topics Google considers key in your niche that you don't have yet.