# ISM Transition : definition of allowed transitions

**Category:** [Technical (archive)](https://discourse.openehr.org/c/technical-archive/156)
**Created:** 2015-03-03 13:46 UTC
**Views:** 8
**Replies:** 4
**URL:** https://discourse.openehr.org/t/ism-transition-definition-of-allowed-transitions/12404

---

## Post #1 by @system

NB! This is a new e-mail on the same subject since I didn’t see any mail on the mailing list. Just to check if it is working

We are currently developing a module for Careplan based on openEHR Archetypes. We are using INSTRUCTION/ACTIVITY/ACTION archetypes to model the clinical process.

One issue we are facing is the need to define which transitions that are allowed for a given Careflow Step.

To explain I will use openEHR-EHR-ACTION.medication.v1 as example. This ACTION archetype have Review medication as an possible ISM_TRANSITION. This is an transition that ends in ACTIVE state.

What we want to express is that this careflow step is only allowed for an active step (openehr::543). This means that is it not allowed to do this careflow step as a start transition (openehr::540).

A proposed ADL definition for this is given below:

**ISM_TRANSITION[at0005] matches { -- Review medication**

**current_state matches {**

**DV_CODED_TEXT matches {**

**defining_code matches {[openehr::245]}**

**}**

**}**

**transition matches{**

**DV_CODED_TEXT matches {**

**defining_code matches {[openehr::543] } – only allow transition 543 (active)**

**}**

**}**

**careflow_step matches {**

**DV_CODED_TEXT matches {**

**defining_code matches {[local::at0005]} -- Review medication**

**}**

**}**

**}**

To expand this example we want to allow only two transitions, i.e. “active step” (openehr::543) and “resume” (openehr::546).

A proposed ADL definition for this is given below:

**ISM_TRANSITION[at0005] matches { -- Review medication**

**current_state matches {**

**DV_CODED_TEXT matches {**

**defining_code matches {[openehr::245]}**

**}**

**}**

**transition matches{**

**DV_CODED_TEXT matches {**

**defining_code matches {[openehr::543],[openehr::546] }**

**}**

**}**

**careflow_step matches {**

**DV_CODED_TEXT matches {**

**defining_code matches {[local::at0005]} -- Review medication**

**}**

**}**

**}**

And then the questions:

1. Is the first example allowed?
(defining the allowed transition)

2. Is the second example allowed?
(defining two allowed transitions)

Vennlig hilsen
Bjørn Næss
Produktansvarlig
DIPS ASA

Mobil +47 93 43 29 10

---

## Post #2 by @yampeku

The second example should be \{\[openehr::543,546\]\} instead on
\{\[openehr::543\],\[openehr::546\]\} but everything else is fine\. I think
your use case is not different than constraining any other openEHR
local terminology\. This is the first time I've seen someone making a
real Action archetype, so I'm not really sure if it makes sense to
create them in the first place ;D

---

## Post #3 by @system

Hi Bjørn,

I'm not sure I can answer your technical question but thought I should flag up that I am likely to be working on the pharmacy review use case for a UK project. My initial analysis is that this might require a separate archetype, or at least some extra detail. It might be worth comparing requirements.

Ian

---

## Post #4 by @system

Thanks Ian

I forgot to tell that the example was only technical. I just picked Medication as an example J

Anyway I guess this kind of technical possibilities is useful for the pharmacy review. And - then we must work on the tools to support this kind of definitions.

/
Bjørn Næss
DIPS ASA

Mobil +47 93 43 29 10

---

## Post #5 by @system

Aw well, we should have a real use-case for you to ponder over very soon :)

Ian

---


**Canonical:** https://discourse.openehr.org/t/ism-transition-definition-of-allowed-transitions/12404
**Original content:** https://discourse.openehr.org/t/ism-transition-definition-of-allowed-transitions/12404