Refers to mistakes caused by human action or oversight, as opposed to mechanical or system failures. Common in business, engineering, and safety contexts.
事故の原因は人為ミスだった。
The cause of the accident was human error.
人為ミスを防ぐためにチェックリストを導入した。
We introduced a checklist to prevent human error.
Compound of 人為 (じんい, 'human-caused') and ミス (from English 'miss', meaning 'mistake').