According to the Washington Post
Quote:
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Around 8:05 a.m., the Hawaii emergency employee initiated the internal test, according to a timeline released by the state. From a drop-down menu on a computer program, he saw two options: “Test missile alert” and “Missile alert.” He was supposed to choose the former; as much of the world now knows, he chose the latter, an initiation of a real-life missile alert. […]
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https://www.washingtonpost.com/news/...=.afaf4a4a2371
They could have designed the system a bit better to avoid this type of easy mistake.