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# Terminology

## User Roles

- OpenSlice Administrator: Installs, configures and maintains an OpenSlice instance
- OpenSlice Service Designer: Uses available resources to design service specifications that are offered to OpenSlice users
- OpenSlice User: Browses and orders offered services

## Useful Terms

- Service Specification: A blueprint with detailed descriptions of services, including attributes, configurations, performance metrics, and SLAs (e.g. 5G Connectivity).
- Service: A running instance of a Service Specification.
- Resource Specification: A blueprint with detailed descriptions of resources, including attributes, configurations, and instantiation patterns (e.g. a Kubernetes CRD).
- Resource: A running instance of a Resource Specification.
- Resource Facing Service Specification (RFSS): A Service Specification that exposes a Resource Specification as a Service (e.g. UPF Deployment in K8s).
- Customer Facing Service Specification (CFSS): A Service Specification exposed to Users, available for Service Orders. Usually an exposed CFSS (e.g. 5G Connectivity) is a Service Bundle and comprises of other RFSSs (e.g. UPF Deployment, Core Deployment) and CFSSs (e.g. Connect Radio Nodes).
- Resource Facing Service (RFS): An running instance of an RFSS, created via a Service Order of a related Service Bundle.
- Customer Facing Service (CFS): An running instance of an CFSS, created via a Service Order.
- Service Category: A collection of CFSSs.
- Service Catalog: A collection of exposed Service Categories.
- Service Inventory: An inventory of all the service instances.
- Resource Inventory: An inventory of all the resource instances.