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Paper Abstract and Keywords
Presentation 2026-09-03 09:20
A Method for Evaluating the Validity of Documents Generated from Source Code Using LLMs
Yuta Arai, Kazuhiro Kikuma (Nihon Univ.) IN2026-34
Abstract (in Japanese) (See Japanese page) 
(in English) In recent years, the acceleration of digital transformation (DX) has increased the demand for rapid system development. However, supporting documents, such as requirements specifications, design documents, and maintenance manuals, may not be sufficiently maintained because the development of functional source code is often prioritized. Consequently, developers must re-examine specifications and design intentions from source code when maintaining, extending, or migrating existing systems.
We are studying software development support methods using large language models (LLMs) to reduce development and maintenance workloads and improve software quality. As one approach, we use LLM-based reverse engineering to generate design documents and requirements specifications from existing source code. Although LLMs can generate natural-language design documents, these documents may not accurately reflect the specifications and processing conditions of the original code. Moreover, manually detecting errors and missing information is difficult for large-scale systems. We therefore evaluate the validity of generated design documents by regenerating source code from them.
In this paper, an LLM generates design documents describing class and function responsibilities, inputs and outputs, internal states, processing procedures, and exception conditions, and then regenerates source code from them. We compare the effects of comment presence and the use of retrieval-augmented generation (RAG) during design document generation.
Keyword (in Japanese) (See Japanese page) 
(in English) LLM / Reverse Engineering / Design Document Generation / RAG / / / /  
Reference Info. IEICE Tech. Rep., vol. 126, no. 165, IN2026-34, pp. 1-6, Sept. 2026.
Paper # IN2026-34 
Date of Issue 2026-08-27 (IN) 
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 IN2026-34

Conference Information
Committee NS IN CS NV  
Conference Date 2026-09-03 - 2026-09-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Tohoku University + Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Session management (SIP/IMS), Interoperability/Standardization, NGN/NwGN/Future networks, Cloud/Data center networks, SDN (OpenFlow, etc.)/NFV, IPv6, Machine learning, etc. 
Paper Information
Registration To IN 
Conference Code 2026-09-NS-IN-CS-NV 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Method for Evaluating the Validity of Documents Generated from Source Code Using LLMs 
Sub Title (in English)  
Keyword(1) LLM  
Keyword(2) Reverse Engineering  
Keyword(3) Design Document Generation  
Keyword(4) RAG  
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1st Author's Name Yuta Arai  
1st Author's Affiliation Nihon University (Nihon Univ.)
2nd Author's Name Kazuhiro Kikuma  
2nd Author's Affiliation Nihon University (Nihon Univ.)
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Speaker Author-1 
Date Time 2026-09-03 09:20:00 
Presentation Time 25 minutes 
Registration for IN 
Paper # IN2026-34 
Volume (vol) vol.126 
Number (no) no.165 
Page pp.1-6 
#Pages 6 
Date of Issue 2026-08-27 (IN) 

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