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Paper Abstract and Keywords
Presentation 2026-03-20 11:30
Proposal for a Visual Organization Tool to Support the Integration of Loss Scenarios in STAMP/STPA -- Implementation of Structuring and Hierarchical Functions Using astah* System Safety --
Gyoto Yonemoto, Yutaka Matsuno (Nihon Univ.), Toshinori Takai (NAIST), Keishi Okamoto (NIT, Sendai College) KBSE2025-65
Abstract (in Japanese) (See Japanese page) 
(in English) STPA (System Theoretic Process Analysis) is an effective method for safety analysis of complex systems. However, as the analysis progresses, the number of loss scenarios becomes enormous, making it difficult to identify duplicates and derive countermeasures. This study proposes a method specialized for organizing loss scenarios after identification by applying the tree structure of GSN (Goal Structuring Notation). The proposed method reinterprets GSN node concepts for hierarchical organization of loss scenarios, realizing a structure where countermeasures for higher-level scenarios can be applied to lower-level scenarios. We implemented the method as a plugin for astah* System Safety and conducted a comparative experiment with 10 graduate students. The results showed that while Excel was superior in task completion rate, the proposed tool excelled in ease of duplicate detection and satisfaction with output quality. These results suggest that GSN-based visualization supports the comprehension of loss scenario structures.
Keyword (in Japanese) (See Japanese page) 
(in English) STPA / Loss Scenario / GSN / Hierarchical Structuring / Safety Analysis / Visualization Tool / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 423, KBSE2025-65, pp. 97-102, March 2026.
Paper # KBSE2025-65 
Date of Issue 2026-03-12 (KBSE) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF KBSE2025-65

Conference Information
Committee KBSE  
Conference Date 2026-03-19 - 2026-03-20 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa Prefectural General Welfare Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To KBSE 
Conference Code 2026-03-KBSE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Proposal for a Visual Organization Tool to Support the Integration of Loss Scenarios in STAMP/STPA 
Sub Title (in English) Implementation of Structuring and Hierarchical Functions Using astah* System Safety 
Keyword(1) STPA  
Keyword(2) Loss Scenario  
Keyword(3) GSN  
Keyword(4) Hierarchical Structuring  
Keyword(5) Safety Analysis  
Keyword(6) Visualization Tool  
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Keyword(8)  
1st Author's Name Gyoto Yonemoto  
1st Author's Affiliation Nihon University (Nihon Univ.)
2nd Author's Name Yutaka Matsuno  
2nd Author's Affiliation Nihon University (Nihon Univ.)
3rd Author's Name Toshinori Takai  
3rd Author's Affiliation Nara Institute of Science and Technology (NAIST)
4th Author's Name Keishi Okamoto  
4th Author's Affiliation National Institute of Technology, Sendai College (NIT, Sendai College)
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Speaker Author-1 
Date Time 2026-03-20 11:30:00 
Presentation Time 30 minutes 
Registration for KBSE 
Paper # KBSE2025-65 
Volume (vol) vol.125 
Number (no) no.423 
Page pp.97-102 
#Pages 6 
Date of Issue 2026-03-12 (KBSE) 

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