• Package
• IT Capability – this is a infrastructural capability that is provided to the applications. Examples include Persistence, Message Routing, Security, and Directory & Authentication Services.
• Site – a physical location of the enteprise where its IT systems reside.
• Network Region – a demarcated segment of the network, e.g. DMZ, intranet.
• Vendor – a supplier of some infrastructural product or service.

• IT App – an application that realizes IT Capabilities. A Business App may be standalone or be part of a Business System
• Service – functionality that encapsulates data access or business functionality that is provided to software clients (Service Oriented Architecture).

• Server Model – the configuration of a server that can be purchased from a server vendor. An instance of a Server Model, i.e. a Server, is modeled by creating an instance of a Server Model.
• Server Frame Model – the configuration of a server that can be purchased from a server vendor. An instance of a Server Frame Model, i.e. a Server, is modeled by creating an instance of a Server Frame Model. Servers may be logically deployed on a Server Frame.
• PC Model – the configuration of a PC that can be purchased from a PC vendor. An instance of a PC Model, i.e. a Server, is modeled by creating an instance of a PC Model.
• Network Node Model – generic version of a Server Model to be used for nodes that are not considered Servers or Server Frames.
• Firewall Model –
• Router Model –
• Switch Model –
• Load Balancer Model –
• CSU/DSU Model –
• Device Model – the configuration of a device that can be purchased from a device vendor. An instance of a Device Model, i.e. a Device, is modeled by creating an instance of a Device Model.
• Network Adapter – a device used by a computer to access the network. This is modeled as a port that is placed on the network node (Server, etc).
• IP – a Network Adapter that uses the TCP/IP protocol.
• Port – a TCP/IP port that an application or service "listens on"

These are user modeled classes that define the values that may be given to other model element's tagged values.

• Device Type – examples: <<Device Type>> Harddrive, <<Device Type>> SAN, <<Device Type>>
• Network Node Type – examples: <<Network Node Type>> Firewall, <<Network Node Type>> Switch
• Network Type - <<Network Type>> Satellite, <<Network Type>>T1, <<Network Type>> Ethernet
• Service Type – See (EA)² Application Architecture Toolbox
• File Type – examples: <<File Type>> CSV, <<File Type>> Fixed Length.
• Schedule –  used to create the types of schedules that may apply to business processes, activities, ETL Jobs, etc. Examples: <<Schedule>> Monthly, <<Schedule>> Daily, <<Schedule>> Intra-day