問6
頻出度★★★
情報システムの開発の際に作成される業務モデルが表現しているものはどれか。
平成26年度 春期 ITパスポート試験 問6
ストラテジ系システム戦略 › 業務プロセス
This question's explanation and your answers so far.
解説
問 6
Incorrectア
The system requirements of the current business system are conditions on the system side, such as the functions and performance that the existing system satisfies; that is a different target from a business model, which depicts the flow of the business itself. This corresponds to the results of investigating the current system (current system analysis).
Incorrectイ
The difference between the current business processes and the business processes assumed by an ERP package is the result of a fit-and-gap analysis (gap analysis). A business model is the material used to make that comparison (the picture of the current business); it is not something that expresses the difference itself.
- ウ
正解 A business model is a model that, when an information system is to be developed, first organizes into a visible form how the target business is currently carried out (the current state) and how it should be carried out from now on (the ideal state), using business flow diagrams, DFDs, E-R diagrams, and so on. In other words, what is modeled is not the computer but the business itself. It expresses the structure and processes of the business: who does the work, in what order, and using what information. Building it first lets developers and business staff share the same understanding of the business, and it becomes the foundation for the requirements definition and system design that follow. Therefore ウ, which says “the structure and processes of the business that is the target of system development”, is the correct answer.
Incorrectエ
The system requirements of a newly developed business system correspond to the deliverable of requirements definition (the requirements definition document). A business model is created in the business analysis stage, before requirements definition, and serves as the input for deriving the requirements, so it is not the requirements themselves.
ここがポイント
- A business model models the business, not the system. It visualizes the structure, procedures, and information flow of the business using business flow diagrams, DFDs, E-R diagrams, and so on.
- The key point is the order in which things are created: business model (business analysis) → requirements definition (system requirements) → design and development. Identifying the differences between the current business and the package's standard business when introducing ERP is fit-and-gap analysis, which must be distinguished from a business model.