# Does Screena provide versioning capabilities?

Yes, every version of a watchlist record is kept in memory and corresponds to a **revision numeric value**. In addition to the revision value, every record is tagged with its creation date/time and updated date/time. Consequently, you can access any event affecting a record including:

* the current revision (i.e. most recent published version),
* any corrections or enhancements, and
* any other changes made to the record in question.

The first version of a record is always numbered as revision number 1.

We also keep in memory the date/time when a record was last matched to manage deltas as needed for [periodic screening](https://developer.screena.ai/#periodic-screening).


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