# Mixed absolute value and delta Events in a History

**URL:** <https://discourse.openehr.org/t/mixed-absolute-value-and-delta-events-in-a-history/2337>\
**Category:** RM\
**Created:** [5 February 2022 14:29 UTC](https://discourse.openehr.org/t/mixed-absolute-value-and-delta-events-in-a-history/2337 "2022-02-05T14:29:48Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![heather.leslie](https://discourse.openehr.org/user_avatar/discourse.openehr.org/heather.leslie/32/1980_2.png) [@heather.leslie](https://discourse.openehr.org/u/heather.leslie)\
**Post date:** [7 February 2022 04:20 UTC](https://discourse.openehr.org/t/mixed-absolute-value-and-delta-events-in-a-history/2337/2 "2022-02-07T04:20:26Z")

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I’m not so sure that this clinical scenario should be modelled using a single archetype because of the associated RM and implementation gymnastics required, but mostly because I’m of the opinion they are two separate concepts that need two separate archetypes.

My thoughts inline in the original thread - [Change over time in an OBSERVATION measurement, represented as % - #8 by heather.leslie](https://discourse.openehr.org/t/change-over-time-in-an-observation-measurement-represented-as/2329/8)

Maybe there are other clinical scenarios that warrant this discussion, but I can’t think of any at the moment. Happy for other scenarios to be suggested…

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