An event taxonomy is a shared language for behaviour. When that language grows without rules, teams lose time translating names, questioning properties and rebuilding the same metric in different ways.
Begin with questions and entities
List the decisions analytics must support, then identify stable product entities such as account, order, search or session. Events should describe meaningful actions involving those entities. Avoid names tied to a temporary screen layout when the underlying behaviour is likely to remain.
Pair a clear action with a clear object, then place changing context in documented properties.
Define the whole contract
A name alone is not a specification. Document when the event fires, which actor triggers it, required properties, allowed values, identity state and known exclusions. Assign an owner and include examples that engineering and analysts can test.
Govern change without freezing progress
Review additions before implementation, version breaking changes and monitor volume or property completeness after release. Deprecate old events deliberately. A lightweight review process is cheaper than repeatedly repairing journey reports downstream.