問47
頻出度★★★
現行システムを新システムに切り替えるに当たり, 現行システムから新システムに移行すべきデータ, 移行に必要な資源などを整理して, 移行計画書を作成した。移行計画書に含める事項として, 最も適切なものはどれか。
平成22年度 秋期 ITパスポート試験 問47
マネジメント系システム開発技術 › システム開発技術
This question's explanation and your answers so far.
解説
問 47
Incorrectア
Operating procedures for the screens and reports provided by the new system are explanations that let users work with the system day to day, and they belong in the user manual (operation manual) or in user education and training materials. They are not a plan for the switchover work of migration itself, so they cannot be called the core of a migration plan.
- イ
正解 The correct answer is イ. A migration plan is a document that brings together the implementation plan for safely switching from the current system over to the new system. As the question states, the data to be migrated and the resources needed for migration have already been organized, so what the plan needs next is the schedule of when and in what order the switchover happens, and the organizational structure of who is in charge of what and who makes the decisions. Concretely, it covers the timetable and milestones of the migration work, when the migration rehearsal (migration test) is carried out, the work procedure and time plan for the switchover day, how long the parallel running period lasts, the division of roles between the responsible manager and the staff doing the work, and the contact route and the decision maker for a rollback (recovery) if trouble occurs. Choice イ, the schedule and organizational structure for switching over to the new system, refers to exactly these things, and it is the most appropriate item to include in the migration plan.
Incorrectウ
The functional requirements demanded of the new system are written in the deliverable of the requirements definition process (the requirements definition document), which comes before development. By the time the migration plan is prepared, the new system has already been built and is at the stage of being switched over, so this belongs to a different process.
Incorrectエ
Procedures for periodically backing up data are routine operational work repeated day after day once the new system has started running, and they belong in the operations procedure manual (operations design). They are a different thing from the one-time backup taken just before migration in preparation for a rollback; the word periodically alone tells you this is about daily operations.
ここがポイント
- Items to include in a migration plan = the migration targets (data and resources), the migration schedule, the implementation structure and division of roles, the migration procedure, the migration rehearsal (migration test), the way parallel running is done, and the criteria for a rollback (recovery) if trouble occurs. In short, it is the document that defines when, by whom, and how the switchover is carried out.
- You can eliminate the wrong choices by matching each deliverable to its process. Functional requirements go in the requirements definition document (requirements definition process); operating procedures for screens and reports go in the user manual (education and training); periodic backup procedures go in the operations procedure manual (operations and maintenance process); and the schedule and structure for the switchover go in the migration plan (migration process).
用語