A codebook is only useful if the coding team can agree on what each code means and where it fits relative to the others. This screen organizes codes into a hierarchical taxonomy — parent themes with child codes nested underneath — and lets you set explicit inclusion criteria for each one, so "does this excerpt count as X?" has a documented answer instead of relying on a coder's memory. Coded excerpts are linked directly to their code definitions, making it straightforward to audit consistency later or export a clean codebook alongside your inter-coder agreement statistics for a methods section. Codes created or edited here feed directly into the AI codebook generator, so AI-suggested codes and manually defined ones live in the same taxonomy.