Astah System Safety
Secures Safety
By Designs

Astah System Safety is a modeling tool for safety-critical systems to support system architecture modeling, system safety assessment and analysis using STAMP/STPA, SysML, ASAM SCDL and GSN.
This is for the automotive domain industry with self-driving cars that work with SOTIF and ISO 26262, and aerospace, railways, defense, robotics and healthcare industries where the safety property is crucial and also who are interested in adopting Model-Based Systems Engineering(MBSE).
Try Now Read v7.0 Release Note

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Demo Video

You can watch this video on BiliBili if you cannot access YouTube.
Astah System Safety is listed as ASAM related products.

Astah System Safety Features

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SysML Diagrams


Astah System Safety’s SysML support is more advanced than what “Astah SysML” offers including the abilities such as merge and comparing project files, XMI import/export, and integration with Cameo Systems Modeler by Dassault Systèmes.

Block Definition Diagram (BDD)
Internal Block Diagram (IBD)
Parametric Diagram
Requirement Diagram / Table
UseCase Diagram
Activity Diagram
Statemachine Diagram
Sequence Diagram


STAMP (System-Theoretic Accident Model and Processes) is an accident causality model based on systems theory developed by Prof. Dr. Nancy Leveson at MIT and STPA (System-Theoretic Process Analysis) is a technique based on STAMP. Astah System Safety provides the following diagrams and tables for your STPA analysis process.

Control Structure Diagram
Precondition Table
Control Loop Diagram
UCA(Unsafe Control Action) Table
Loss Scenario Table
Countermeasure Table
Accident Hazard Safety Constraint Table
CS (Component Structure) Entire view
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ASAM SCDL (Safety Concept Description Language) is semi-formal notation to describe ISO 26262 safety architectures, namely safety concepts. This includes safety requirement specifications, element architectures, requirements allocation on elements, ASIL assignments, decompositions for safety mechanisms and others.

Safety Concept Diagram

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Astah GSN Diagram

GSN (Goal Structuring Notation)

You can visualize the safety arguments using Goal Structuring Notation and also D-Case that effectively works for Consensus Building and Accountability Achievement.

GSN (Goal Structuring Notation)/ D-Case

We have another editor dedicated to GSN only called “Astah GSN“.
Astah System Safety includes all the functionalities that Astah GSN has.


Combining STPA with SysML

Convert and sync models

Convert and Sync models to keep consistency

XMI Import / Export

XMI Support

API Support

API Support

Why Astah System Safety?

Astah was originally created by Japanese company ChangeVision in 2006 as a UML modeling tool. The software has grown to include six different tools, each designed to meet different diagramming needs by incorporating user feedback for more than 15 years. Astah System Safety is the latest product we proudly launched for safety-critical systems.

Astah combines STPA and SysML by enabling the models conversions which help you structure STPA analysis by directly using the SysML blocks to create Components and more. By handling the same model in a project will keep the consistency and everything is easily traceable throughout your analysis process.

XMI Import / Export of SysML models are supported which enables you to load data from Cameo Systems Modeler. You can also add the OMG XMI 2.5 format profile.

Try it for free for 40 days

Team Licensing for

Floating License

Annual license
Self-hosted server required
Available from 1 seat


Timed License

Non-floating Annual license
USD550 / €480 per license
Purchase a license for a number of users