STAMP/STPA and SCDL Diagrams

Astah System Safety supports the following diagrams.
We will be updating this page with more detailed information.

Astah System Safety
Safety Concept Diagram

Safety Concept Diagram

[SCDL]
Safety Concept Diagram is a structure diagram to represent architecture of the functional safety. It visualizes interactions between requirements, allocations between elements and requirements, and you can add the “weight” properties to decompositions.

This is a similar diagram to Function Block Diagram (FBD), so that it can be widely used not limited to ISO 26262.

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Precondition Table

Precondition Table

[STAMP/STPA]
Precondition Table shows IDs and names of Preconditions in a table format.

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Accident Hazard Safety Constraint Table

Accident Hazard Safety Constraint Table

[STAMP/STPA]
Accident Hazard Safety Constraint Table is a table to list IDs and contents of the accidents, hazards and safety constraints.

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Control Structure Diagram

Control Structure Diagram

[STAMP/STPA]
Control Structure Diagram shows the structure and relationship of the analysis subject.

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UCA (Unsafe Control Action) Table

UCA (Unsafe Control Action) Table

[STAMP/STPA]
The UCA (Unsafe Control Action) Table is a table to analyze the control actions (those are automatically extracted from the control structure) based on the guided words.

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Control Loop Diagram

Control Loop Diagram

[STAMP/STPA]
Control Loop Diagram shows the extracted components related to control actions. You can generate a Control Loop Diagram individually for each control action.

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HCF (Hazard Casual Factor) Table

Loss Scenario Table

[STAMP/STPA]
Loss Scenario Table is a table to analyze the HCF (Hazard Causal Factor) related to a specific UCA (Unsafe Control Action).

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Countermeasure Table

Countermeasure Table

[STAMP/STPA]
The Countermeasure Table designs the countermeasures for the extracted Hazard Casual Factors.

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