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IHTSDO SNOMED International specifies and distributes a range of different reference set types as part of the International release of SNOMED CT. These types of reference sets have been specified to provide a foundation for the more general requirements that may arise when implementing/enabling SNOMED CT in clinical information systems. 

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These reference set types are included in this guide, as they relate to the practical use of SNOMED CT content in clinical information systems. 
Other types of reference sets, such as the simple map reference set and the complex and extended map reference 4.2.8. Simple Map Reference Set and the  4.2.9. Complex and Extended Map Reference Sets set are important for the co-existence of SNOMED CT and other code systems, but are addressed in other guides. Some reference sets are used to hold metadata, which is used for management or maintenance purposes, such as the historical association reference set and the module dependency reference set 4.2.11. Module Dependency Reference Set. These reference set types will not be covered in this guide.