What is a 'slip' in the context of errors?

In the context of errors, a 'slip' specifically refers to an error that arises from inattention or a lapse in focus during a task. This type of error often happens when an individual makes a mistake in execution, typically while performing a well-learned behavior or routine task. For example, if a pilot forgets to check an instrument because they are momentarily distracted, that oversight would be classified as a slip.

This definition clarifies that a slip is not about making a deliberate choice or a strategic error, as those involve a conscious decision-making process. Nor is it typically considered an unavoidable mistake, which implies that external factors or lack of knowledge led to the error. Instead, slips highlight the importance of maintaining focus and concentration while performing critical tasks, such as those in aviation, where inattention can lead to significant consequences.