# Two-level modeling

**Category:** [New to openEHR?](https://discourse.openehr.org/c/new-to-openehr/13)
**Created:** 2023-11-24 23:26 UTC
**Views:** 528
**Replies:** 3
**URL:** https://discourse.openehr.org/t/two-level-modeling/4701

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## Post #1 by @Nikolai_Ryzhikov

Guys, can you elaborate on two-level modeling a little bit?

Is it the same as "model-driven architecture" or not?
By model-driven architecture, I mean systems that could be configured with model metadata.  Or there are more than this in "two-level modeling"?

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## Post #2 by @Nikolai_Ryzhikov

I read couple of papers by Thomas about two-level methodology and still didn't get it. I have some background in semantic web/ descriptive logic, fhir and v3/rim, ddd,  model-driven arch, oop and fp etc :(

I probably can repeat claims from papers, but i really didn't get it. Help me ;)

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## Post #3 by @birger.haarbrandt

Hi @Nikolai_Ryzhikov,

I think this section within the openEHR specifications provide some good information on this question: https://specifications.openehr.org/releases/BASE/latest/architecture_overview.html#_multi_level_modelling_and_archetypes

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## Post #4 by @Seref

Read on Object Constraint Language and its use cases in addition to Birger's suggestion, then take a look at ADL specifications.

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**Canonical:** https://discourse.openehr.org/t/two-level-modeling/4701
**Original content:** https://discourse.openehr.org/t/two-level-modeling/4701