> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-ct-practical-guides/snomed-ct-mapping-guide/introduction/3-mapping-methodology.md).

# Mapping methodology

These guidelines were developed to assist map developers in producing a map that benefits all users and ensures that downstream users of data produced by the map can use the information consistently and reliably.

A robust mapping methodology will assist in producing quality maps that are usable, reproducible and understandable.

{% tabs fullWidth="false" %}
{% tab title="Usable" %}

* Quality mappings will support the use cases they were intended for
* There is a maintenance in the meaning of the source and target code systems
* Mapping needs to be able to be maintained where:
  * there are updates to the source code system
  * there are updates to the target code system
  * there are updates to user requirements or use cases
    {% endtab %}

{% tab title="Reproducible" %}

* Clear methodology ensures a repeatable quality approach to mapping
* Mappings need to employ authoritative reference sources uniformly
* Documentation defines all assumptions, rules, and procedures required to manage context and create the map
  {% endtab %}

{% tab title="Understandable" %}

* All mappings should have a stated purpose and audience
* Map documentation is complete, clear, and unambiguous
* Mappings define the source and target domain scope for the map
* Consider also possible instances where misuse of the map may influence data quality, reporting or interpretation of data /analytics
  {% endtab %}
  {% endtabs %}

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