The failure of a planned action to be completed as intended is referred to as a(n) _____.

The term "error of execution" specifically designates the failure of a planned action or task to be completed as intended. This encompasses instances where a person intends to carry out a specific task but fails to do so due to issues related to execution, such as lack of follow-through or improper techniques. It highlights the distinction between knowing what to do and actually performing it correctly.

In contrast, systematic errors refer to consistent inaccuracies arising from a flaw in the measurement system or process rather than a failure to execute a plan. Judgment errors involve incorrect conclusions based on interpretation or assessment rather than an execution failure. Unintentional mistakes imply a broader category of errors that may not directly relate to execution but can stem from various underlying causes. Thus, the appropriate terminology for an action not being completed as planned is "error of execution," denoting a specific breakdown in the execution phase of a task or planned action.