Test your taxonomy against the world's.

Why taxonomy developers use ACT-ID

Every new or revised taxonomy is drafted largely in isolation — against the drafting team's own market, sectors, and precedent. It's rarely checked, systematically, against the activity lists of the taxonomies that already exist. That leaves two risks invisible until after publication: genuine duplication of ground already well-covered elsewhere, and definitions that are subtly incompatible with how peer taxonomies scope the same activity — creating friction for every issuer and investor who later has to reconcile the two.

ACT-ID's registry already spans 26 taxonomies mapped to a common set of activity identifiers. Checking a draft against that base is a matter of comparing your activity list to the union, not commissioning a fresh cross-taxonomy review.

Crosswalks as the comparison artifact

The crosswalks are downloadable, pairwise comparison tables between taxonomies already in the registry. Use the same structure to see, activity by activity, where your draft's categories line up with an existing taxonomy's — and where they don't.

The union of every taxonomy's activities

The SUM-OF-ALL taxonomy is the union of every activity across every tracked taxonomy in one list. Checking a draft category against SUM-OF-ALL is the fastest way to see whether it already exists somewhere else, under a different name.

The version registry

/taxonomies tracks every version of every taxonomy the registry follows — lifecycle state, registration tier, and a content hash per version. When your draft moves from consultation to publication, it can be tracked the same way.

Says who? Check for yourself.

Every mapping and classification in the registry carries its source: the document, the page, the method, and a confidence rating. The full registry is downloadable under CC-BY 4.0. Don't take our word for a stated overlap or novelty claim — open the mapping and check its source.