F3_SSTA System State Viewpoint

Purpose

The System State Viewpoint defines the conditions of the SOI or parts of thereof that constrain the execution of System Functions. System States are used as pre- or post-condition of System Use Cases, and as constraints within the definition of System Functions to specifying valid transitions. Valid transitions between System States and the conditions for transitioning are specified in system wide concepts captured in System Requirements.

Applicability

The System State Viewpoint supports the activities included in the “System Requirements Definition Process” of the INCOSE SYSTEMS ENGINEERING HANDBOOK 2023 [§2.3.5.3] and contributes to the System Function Definition.

Supported Processes

Supported Information Items

Presentation

A block definition diagram (BDD) featuring states, and state transitions. Note: References to model elements that are dependent of states, or transitions shall be shown as callout, or compartment notation.

A tabular format listing states, state transitions, and the conditons to be fullfilled before the transition will occur. References to model elements that are dependent of states (Domain Item Kinds, System Functions, System Use Cases, etc.), or transitions shall be shown in the table.

Stakeholder

Concern

Exposed Concepts

The Diagram shows the concepts exposed by the viewpoint, and related concepts if necessary.

The Table shows the concepts exposed by the viewpoint, and related concepts if necessary.

ConceptDocumentation
LETbeeingInSSESpecifies the System States a Logical Element can be in.
SDKbeeingInSSESpecifies that a System Domain Kind can have certain states. Note: Of course an item is in only one distinct state at a certain time. The multiplicity means that an Item can have a set of possible states, and a state can be used to specify possible States for several domain items.
System StateDescribes a state (or mode) of something on system level that can have distinct states.
SFNhasPreconditionSSESpecifies the fact a System Function may have System States as precondition. This means that the Function is only provided in distinct States.
System State TransitionDescribes an allowed transition between two system states of an item that can be in distinct States.
SFNhasPostconditionSSESpecifies the fact that a System Function can perform a particular set of transitions, resulting in the related target System States.
triggeringspecifies that an System Triggering Event triggers a System State Transition.

Realization of exposed Concepts

The Diagram shows the realization of exposed concepts.

The Table shows the realization of exposed concepts.

Required Viewpoints

Example