# Evaluate and test

Ensuring the quality of a map is important for the successful use of SNOMED CT. It is crucial that the content of the map references the concepts which represent the meaning of the source data it is to be linked to. In addition, it is important that the human interpretation of the concepts referred to aligns with the logical definition provided by SNOMED CT. Even when using maps for less patient safety critical purposes, the quality of the map needs to be sufficient to be trusted to serve its purpose.

## Stages of Quality Assurance

Reviewing a reference set is important throughout the reference set development process, however at least three types of validation should be emphasized, see illustration below.

* Design review: The overall objective with this review is to verify whether the map design meets the requirements.
* Content review: The overall objective with this review is to verify whether the selected targets are appropriately mapped to the source codes.
* Test: The overall objective with testing the map is to validate the map in the context where it is to be used. Testing is done to assure that the map meets the needs of the involved stakeholders.

<figure><img src="/files/nKUUN17ExNsPETrZe5Ai" alt=""><figcaption></figcaption></figure>

## Test

In addition to the abstract assurance of the subset in isolation, there may be a requirement for a level of testing to be undertaken in healthcare systems, and tested under the exact circumstances of intended use. This may be undertaken by releasing a technology preview targeted at specific bodies for feedback. An impact assessment and, most importantly, safety testing will need to take place upon deployment of the subset into systems, particularly where significant changes have taken place.

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