With examination of and reference to System Theoretic Accident Model and Processes (STAMP) and its safety analysis application, "System Theoretic Process Analysis "STPA." IPA/SEC is conducting research and survey of safety analysis and evaluation processes in alignment with Japanese software development standards.
Traditional safety analysis methods are all 40-65 years old, but our systems have changed completely
WHAT IS STAMP ?
STAMP: Systems-Theoretic Accident Model and Processes
Premise: Some properties can only be treated adequately in their entirety, taking into account all social and technical aspects. These properties emergently arise from the relationships among the components of the system
All mechanisms are explained from the interaction of the components of the system
Causes of actions not working, considered as "improper (in)action of control action", are limited
Step 0-1: Define Purpose of the Analysis
Define target Accident (prevention target event), Hazards (potential situation to accident) and identify Safety Constraints to control Hazards on the system
Step 0-2:Model the Control Structure
Construct Components (subsystem, equipment, organization) and the Interactions (direction, feedback data). Analyze them in order to draw a Control Structure
Step 1:UCA Identification of Unsafe Control Action
For every Control Action on the Control Structure, identify Unsafe Control Actions which may lead to Hazards by applying four guide words. Control Action is defined as necessary interaction to implement Safety Constraints.
Step 2:HCF Identification of Hazard Causal Factors
For every UCA, construct Control Loop Diagram and identify the Hazard Causal Factors (HCF) using guide words. Identify Loss Scenarios.
Final Step :Countermeasures
Deploy countermeasures as safety analysis results
IPA/SEC activities in promoting STAMP/STPA
Our goal :
To disseminate system-based safety analysis based on STAMP/STPA implemented for Japanese industries
Development of processes and guide words of STAMP/STPA through trial analysis
Demonstration of the analysis approach on practical systems and services in Japan
Dissemination of the approaches with seminars and workshops
STAMP tool STAMP Workbench
Features:Open-source, free, easy to use, intended for those interested in using STAMP/STPA on real Systems.