Tom de Jong (consultant with Nova Pro, active member of HL7 International and HL7 the Netherlands) provides an overview of the history and use of the HL7 version 3 Concern Act to model the "episode of illness".

The question posed by Rene Spronk (consultant with ringholm.com, representing HL7 Norway in this case) to Tom is related to healthcare encounters and the grouping thereof, see the HL7 Wiki for a HL7 proposal related to that subject.