Process Analysis Workflow

To which of the process analysis stages does the following description belong?

Event logs, as any other data, can be enriched with various additional attributes. We discussed two ways of enriching an event log: (1) deriving or computing additional data attributes based on the log itself, or (2) adding external data. The throughput time of a case can be a computed data attribute, while adding information on the weather at the time an event occurred is an example of including external data.