Publish 3 supporting articles (one per content pillar)

Publishing the three supporting articles that complete a pillar's initial cluster structure is where the topic cluster strategy transitions from plan to reality — this is the concrete execution step that either validates the earlier planning work or reveals where it needs adjustment once actually put into practice against real writing constraints.

The genuine depth requirement for cluster articles is worth restating clearly, since it's the most common way this step underdelivers: a cluster article that merely restates, in shorter form, what the cornerstone piece already covers wastes the structural opportunity this content type is meant to provide. The value of a cluster article comes specifically from addressing its particular subtopic with real depth the cornerstone piece could only gesture toward given its own broader scope — genuine additional value, not a condensed repeat.

The linking discipline established during this phase sets the pattern the entire cluster will follow going forward. Each supporting article needs a genuine, natural link back to its pillar, and the pillar itself needs to be updated to link forward to each new piece as it publishes — this bidirectional linking is what actually makes the cluster relationship legible to search engines, and it's precisely the kind of detail that's easy to plan correctly but skip in the actual execution under time pressure.

Completing this first real cluster — cornerstone plus three genuine supporting pieces, properly interlinked — provides a concrete template and proof of concept for how subsequent pillars should be built, making the pattern established here worth getting genuinely right, since it's likely to be repeated across the other pillars in the broader content strategy.