問46
頻出度★★☆
システム要件定義で明確にするもののうち, 性能に関する要件はどれか。
令和3年度 ITパスポート試験 問46
ストラテジ系システム企画 › 要件定義
This question's explanation and your answers so far.
解説
問 46
Incorrectア
'The system functions that realize the business requirements' defines what the system does (the processing content to be implemented); it is a functional requirement, not a performance requirement.
Incorrectイ
'The availability rate of the system' is an indicator expressing the proportion of time during a given period that the system operates normally; it is a requirement related to availability and reliability. Its category differs from a performance requirement, which concerns processing speed.
- ウ
正解 The correct answer is ウ. Among the non-functional requirements in system requirements definition, a performance requirement refers to a demand related to the system's processing speed and responsiveness. The response time of the inquiry function is the time from when a user issues a request until the result is returned, which is exactly a representative performance indicator that expresses processing performance. Therefore, 'the response time of the inquiry function' is a performance-related requirement.
Incorrectエ
'The recovery time from a failure' is the time required from the occurrence of a failure until recovery; it is a reliability and maintainability requirement associated with Mean Time To Repair (MTTR), not a performance requirement that expresses processing speed.
ここがポイント
- In system requirements definition, requirements are clarified by dividing them into functional requirements and non-functional requirements. Items related to processing speed, such as response time and throughput, fall under performance (performance requirements).
- Non-functional requirements are subdivided into performance, reliability (availability rate, MTBF), availability, maintainability (recovery time, MTTR), and so on. Remember the distinction: availability rate and recovery time belong to the reliability side, while response time belongs to the performance side.
用語