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Bounded reference sets are designed to be used together with a specific information model. For example, if a reference set is developed as a value set for recording the smoking status in a specific software system, like shown in the example illustrated below.

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When a reference set is bound to a specific information model, it is important to carefully consider how the binding affect the reference set members. So, for bounded reference sets it is important to clearly specify the relationship between the reference set and the associated information model to guide users, and to ensure correct interpretation of data, when data is subsequently retrieved for purposes such as display, analytics and communication. 

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Unbounded reference sets mean that the reference set is designed to be applicable to multiple use cases, organisations or systems. An example is the SNOMED CT to ICD-10 map, which is released with the International Edition of SNOMED CT, and hence, available for use by any of the IHTSDO members Members and affiliates. It may also be reference sets developed in a IHTSDO member Member country to be used by all cardiovascular surgery departments in that country for reporting the procedures done and the procedure outcome. Such reference sets is distributed together with a National Edition of SNOMED CT.

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