The diagram below lists the Customer Domain's ABEs Level 1 and Level 2.<br/><b>Customer Facing Service Spec ABE</b><br/>        • The Customer Facing Service Spec ABE defines the common characteristics for a set of CustomerFacingServices. This scales by enabling multiple CustomerFacingServiceSpecs to be defined to model the common characteristics of different groups of CustomerFacingServices.<br/><b>Resource Facing Service Spec ABE</b><br/>        • The Resource Facing Service Spec ABE defines the common characteristics for a set of ResourceFacingServices. This scales by enabling multiple ResourceFacingServiceSpecs to be defined to model the common characteristics of different groups of ResourceFacingServices.<br/><b>Service Catalog ABE</b><br/>        • A collection of entities that represent the specification of ServiceCatalogs and catalogs described by them that contain ServiceSpecifications.<br/><b>Customer Facing Service ABE</b><br/>        • The Customer Facing Service ABE defines the characteristics of a particular CustomerFacingService that represents a realization of a Product within an organization's infrastructure.<br/><b>Resource Facing Service ABE</b><br/>        • ResourceFacingService is an abstraction that defines the characteristics of a particular Service which support the network/infrastructure facing part of the service. For example, a VPN is an example of a CustomerFacingService, while the sub-services that perform different types of routing between network devices making up the VPN are examples of ResourceFacingServices.  ResourceFacingServices are "internal" Services that are required to support a CustomerFacingService.<br/><b>Service Level Spec ABE</b><br/>        • This ABE includes a third type of Service Specification entity: that of a ServiceLevelSpecification. This type of specification templatizes Services that are bound to a Service Level Agreement.<br/><b>Service Performance Specification ABE</b><br/>        • The Service Performance Specification ABE defines measure of the manner in which a Service is functioning.<br/>