# Introduction to Concept Model

The *Concept Model* is used to specify logical definitions of *SNOMED CT* concepts. It is based on a combination of formal logic and editorial rules and includes the attributes and values that may be applied to concepts.

| Definition                                                                                                | Note                                                                                                                                                                                                                                                                   |
| --------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| The set of rules that determines the permitted sets of relationships between particular types of concepts | The Concept Model specifies the attributes that can be applied to concepts in particular domains and the ranges of permitted values for each of these attributes. There are also additional rules on the cardinality and grouping of particular types of relationships |

#### Features

{% content-ref url="/pages/oeQqzpe5YhHgMzBFayFj" %}
[Root and Top-level Concepts](/snomed-ct-specifications/snomed-ct-editorial-guide/readme/concept-model-overview/root-and-top-level-concepts.md)
{% endcontent-ref %}

{% content-ref url="/pages/2pjtOMVOsLGSuiI4RVwy" %}
[Attributes](/snomed-ct-specifications/snomed-ct-editorial-guide/readme/concept-model-overview/attributes.md)
{% endcontent-ref %}

{% content-ref url="/pages/x4W43cWfFZEsJFe3H3Fo" %}
[Defining Characteristics](/snomed-ct-specifications/snomed-ct-editorial-guide/readme/concept-model-overview/defining-characteristics.md)
{% endcontent-ref %}

{% content-ref url="/pages/yzVLmxSUhPnAq0tySo2S" %}
[Qualifying Characteristics](/snomed-ct-specifications/snomed-ct-editorial-guide/readme/concept-model-overview/qualifying-characteristics.md)
{% endcontent-ref %}

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