NAF v3: NAV-2 MODAF: AV-2
An L1 view specifies the types of logical Node used in the architecture. The nodes can be organised into a specialisation hierarchy (subtype-supertype).
- User Requirements
- Operational Planning
- High-Level Systems Requirements
An L1 is used to define all the Nodes that will appear in a Logical Architecture. Nodes are elements of capability that are assembled and orchestrated in Logical Architecture. The levels of capability provided by each node are expressed as Measures of Performance, and these may be dependent on the environments in which the Node is required to operate.
- Initial set up of a Logical Architecture
- Defining measure of performance for requirements specification purposes
- Defining the types of environment in which Nodes may operate
An L1 can either be shown as a diagram that traces nodes to capabilities (also showing required measures of performance) or as a table:
Detailed View Description
Nodes are traced to the Capabilities they manifest using the Capability For Node relationship. In addition, Measures of Performance may be specified for each node that map to the Measures of Effectiveness of the Capabilities. Each Measure can be expressed in terms of the environment – e.g. higher performance may be expected in clear weather than in bad.
The L1 helps to de-clutter an L2 by taking care of the properties and capabilities mappings that were previously shown in NAF v3 in NOV-2. It is still possible to show capabilities and properties in an L2 if required though.
Key Elements and Their Relationships
The detailed meta-model for L1 can be viewed here