問33
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, システム移行計画書を作成した。システム移行計画書に記載すべき事項として, 適切なものはどれか。
平成26年度 秋期 ITパスポート試験 問33
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 33
Incorrectア
The selection policy for the system is a policy for deciding what kind of system (a package product or an outsourcing vendor) to choose, and it is set during the system planning and procurement stage (preparing an RFI / RFP, evaluating proposals). By the time the migration plan is written, the new system has already been developed and completed, and what to adopt was decided long before. It has nothing to do with the procedure or schedule of the switch-over work, so it is not appropriate as an item of the migration plan.
- イ
正解 The correct answer is イ. A system migration plan is a document that defines in advance how to carry out safely and reliably the actual migration work of switching from the current (old) system to the new system. Its main contents are: (1) the migration method — a one-time migration (switching everything at once), a phased migration (switching department by department or function by function), or parallel operation in which the old and new systems run at the same time for a certain period; (2) the migration schedule — when the migration work starts, at which point the switch to the new system happens, and when the old system is shut down; (3) the migration organization and division of roles; (4) the scope of the data to be migrated and the procedure for data conversion (migration); (5) the migration rehearsal and the criteria for judging whether to go ahead with the migration; (6) the fallback (rollback) procedure in case the migration fails. Choice イ, “the schedule for parallel operation of the old and new systems,” corresponds exactly to this migration method and migration schedule. Parallel operation lowers migration risk, because business can continue on the old system even if the new system has a defect; on the other hand it creates the burden of double operating costs and double data entry, so the plan must clearly state for which period and for which scope of business parallel operation is performed, and when the old system is to be shut down. It is therefore an appropriate item to describe in a migration plan.
Incorrectウ
The quality evaluation criteria for the deliverables of the new system are the standards for judging whether deliverables such as design documents and programs meet the required level, and they are described in a quality management plan or a test plan. They are indicators for building in and verifying the quality of deliverables during the development process, not the content of a migration plan, which defines when and by what procedure a completed system is switched over to production.
Incorrectエ
The work experience of the project members is information that shows the capability of the staff, and it is referred to in a proposal, an organization chart, or a staffing plan. What a migration plan needs is the organization and division of roles — who is in charge of which migration task — not the past career history of each member itself. It is off the point as an item of a document that specifies the content, schedule, and procedure of the migration work.
ここがポイント
- Remember what a system migration plan describes: the migration method (one-time migration / phased migration / parallel operation), the migration schedule, the migration organization and division of roles, the scope of the data to be migrated and the conversion procedure, the migration rehearsal and the criteria for the go/no-go decision, and the fallback (rollback) procedure in case of failure. The test is whether the item relates to how the switch-over work itself is carried out.
- Do not confuse the documents of different processes: a selection policy belongs to the planning and procurement stage (system planning / RFP), quality evaluation criteria belong to the development stage (quality management plan, test plan), and staff career histories belong to proposals and staffing plans. Keep them apart by remembering that a migration plan targets the switch-over to production after development is finished.
用語