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Issues on defining requirements and SSM as an alternative approach to addressing them

Authors
Publisher
文教大学
Publication Date
Disciplines
  • Design
  • Philosophy

Abstract

 情報システムの開発において、システムに対する要求を分析し仕様を決定するプロセスは、開発の上流工程においてプロジェクトの成功の鍵を握る重要なポイントの一つとして位置づけられ、このプロセスを適切に遂行するためのガイドとして、多くの著名な方法論が提案され、実施されてきた.  しかし最近の情報技術の発展に伴う様々な変化、特に対象業務の質と開発・利用環境の変化によって、構造化システム分析・設計方法論に代表される従来の方法論を要求定義のプロセスにおいて適用しようとしても、うまくいかないことが多く見受けられるようになった.  ここでは、この不具合が従来の方法論の出発点にある基本的な考え方から発生しているので、その解決は容易でないことと、ソフトシステム思考法(SSM)がまさにこの様な問題に対処するための基本的な思考と行動の枠組みを提供する可能性を持っていることを述べる.又この問題の今後の方向と課題について簡単に触れる.  尚本報告は筆者が先に"大岩元他編、情報システムにおける要求工学に関する調査研究、ソフトウェア工学研究財団、平成7年3月"に投稿した同名の論文を元にして、これに加筆、訂正を施したものである.  In an attempt to ensure that only those systems are developed which do just what users really require, a great emphasis has been placed on the early stages of information systems development where the requirements of users are analysed and determined. It is well known that most development methodologies have proposed respective guidelines for how to approach to this critical process.  However, it is not uncommon recently for us to observe systems development projects in which such typical methodologies as structured analysis and design do not work as well in determining requirements of users as they used to do before. This tends to be more evident when they are applied to a more complex situation where people involved have basically different views of the situation.  We try to make it clear in this paper that it is not easy to find a complete solution to the inability of these methodologies to define users requirements in a complex situation, since it stems from the fundamental philosophy about the nature of information systems which underpins these methodologies, and, on the other hand, that soft systems methodology provides a basic framework to deal with problems of this kind. We will, then, briefly review subject areas which seem to be worthy of further reseach.

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