# General Modeling

<mark style="color:$danger;">**This Editorial Guide is used for Education Purposes Only. It is used in the Authoring Courses and Certifications. It is based on the January 2026 Editorial Guide.**</mark>

*SNOMED CT* is arranged as a polyhierarchy. A *hierarchy* is defined as an ordered organization of concept codes linked together through IS A relationships. Concept codes are linked to their more general parent concept codes directly above them in a hierarchy. Concepts with more general meanings are usually located at the top of the hierarchy and then at each level down the hierarchy the meanings become increasingly more specialized.

For general modeling information, use the following links to jump to the following pages:

* [Annotations](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/general-modeling/annotations)
* [Changes to Components](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/general-modeling/changes-to-components)
* [Conjunction and Disjunction](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/general-modeling/conjunction-and-disjunction)
* [General Concept Inclusions - GCIs](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/general-modeling/general-concept-inclusions-gcis)
* [Grouper Concept](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/general-modeling/grouper-concept)
* [Intermediate Primitive Concept Modeling](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/general-modeling/grouper-concept)
* [Proximal Primitive Modeling](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/general-modeling/proximal-primitive-modeling)
* [Relationship Group](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/general-modeling/relationship-group)
* [Sufficiently Defined vs Primitive Concept](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/general-modeling/sufficiently-defined-vs-primitive-concept)
* [Templates](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/general-modeling/templates)

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