This question's explanation and your answers so far.
あるITサービスでは, システムの変更の優先度を即時, 高, 中, 低の四段階に定めている。提案された変更のうち, 即時と判断されるべき変更はどれか。ここで, 変更の定期的なリリースは毎月末に実施されているものとする。
| 優先度 | 説明 |
|---|---|
| 即時 | 生命を危険にさらす, 又は重要な公的サービスの提供能力を大きく減じるものであり, 直ちに対応する。 |
| 高 | 何人かの重要な利用者に深刻な影響を及ぼす, 又は多くの利用者に影響を与えるものであり, 迅速に対応する。 |
| 中 | 深刻な影響はないが, 次の定期リリースまでは延期できない。 |
| 低 | 変更は必要であるが, 次の定期リリースまで待つことができる。 |
This change is needed for the launch of a new service two weeks later, but its target is only a functional improvement of a “supplementary” inquiry screen; it involves neither danger to life nor a stoppage of public services. However, because of the two-week deadline it may not be possible to postpone it until the release at the end of next month, so by definition it corresponds to “medium”. It is not immediate.
An in-house electronic conferencing system has many users, so the scope of impact is wide, but the impact stays within internal company operations and leads to neither danger to life nor a reduced ability to provide public services. It fits the definition “affects many users; must be handled promptly”, so it is “high”, not immediate.
正解 The correct answer is ウ. In the priority definition table, the level “immediate” applies to changes that endanger life or greatly reduce the ability to provide important public services. The disaster information service system in ウ is used to decide whether to issue a regional evacuation advisory. If this system stays in a failed state, the evacuation decision is delayed and residents' lives are directly put at risk. At the same time, providing disaster information is itself an important public service carried out by the local government, so its ability to deliver that service is greatly reduced. Because both requirements of “immediate” — danger to life and a large drop in the ability to provide an important public service — are met, this change must be handled right away, without waiting for the next periodic release at the end of the month.
It is stated explicitly that the bug fix only needs to be done by the processing day of the next month, so there is time to spare. Putting it into the periodic release at the end of the month still makes the next month's processing day, which matches the “low” definition: the change is necessary, but it can wait until the next periodic release. This is the least urgent case, the exact opposite of immediate.