L1 – Node Types

NAF v3: NAV-2 MODAF: AV-2

TaxonomyStructureConnectivityProcessesStatesSequencesInformationConstraintsRoadmap
Logical
Specifications
L1
Node Types
NAV-2
AV-2
L2
Logical Scenario
NOV-2
OV-2
L3
Node Interactions
NOV-2, NOV-3
OV-2,OV-3
L4
Logical Activities
NOV-5
OV-5
L5
Logical States
NOV-6b
OV-6b
L6
Logical Sequence
NOV-6c
OV-6c
L7
Logical Data Model
NSV-11a
OV-7
L8
Logical Constraints
NOV-6a
OV-6a
Lr
Lines of Development
NPV-2
AcV-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).

Concerns Addressed

  • User Requirements
  • Operational Planning
  • High-Level Systems Requirements

Background

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.

Usage

  • 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

Representation

An L1 can either be shown as a diagram that traces nodes to capabilities (also showing required measures of performance) or as a table:

l1-example
l1-example2

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

l1-hlmm

Meta-Model

The detailed meta-model for L1 can be viewed here

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