問93
頻出度★★★
フールプルーフの考え方を適用した例として, 適切なものはどれか。
令和5年度 ITパスポート試験 問93
テクノロジ系システム構成要素 › システムの評価指標
This question's explanation and your answers so far.
解説
問 93
Incorrectア
Configuring HDDs in a RAID array is a mechanism that groups multiple disks to provide redundancy so that data is not lost even when a disk fails. This is fault tolerant (failure-resistant design), not fool-proof, which prevents user mis-operation.
Incorrectイ
Maintaining minimal functionality and continuing processing even when a failure occurs is the fail-soft concept (degraded operation / graceful degradation). It is a design that keeps the impact of a failure small, which differs from fool-proof, whose aim is to prevent mis-operation.
Incorrectウ
Duplicating the system to prepare for failures is fault tolerance achieved through redundancy (a dual system). It is a safeguard against equipment failure, not fool-proof, which prevents human operation mistakes before they happen.
- エ
正解 The correct answer is エ. Fool-proof refers to a design concept that prepares in advance so that even if a user performs a wrong operation, it does not lead to a dangerous state or damage. Option エ, “displaying a confirmation message asking whether it is OK to delete when a file is being deleted,” is a mechanism that stops the human error of a user accidentally erasing a needed file right before an irreversible operation — exactly a typical example of fool-proof.
ここがポイント
- Fool-proof = a design concept that assumes users will mis-operate and ensures that even a wrong operation causes no problem (confirmation messages, input-value checks, connector shapes that cannot be inserted the wrong way, etc.).
- Distinguish fault tolerant (redundancy, RAID, duplication) and fail-soft (degraded operation), which are “preparation against failure,” from fool-proof, which is “preparation against mis-operation.”
用語