Which of the following is NOT a common way to divide labor?

Dividing labor efficiently is crucial for maximizing productivity in any organization, including firefighting teams. Common methods of labor division are based on criteria that help streamline operations and utilize skills effectively.

When considering the correct answer, dividing labor by "interest" is not a conventional method within organizational structures. Instead, labor is typically segmented by area, where teams are assigned specific geographic regions to manage tasks; by function, where individuals are grouped based on their roles and responsibilities, such as fire suppression, emergency medical services, and administrative duties; or by complexity, where tasks are divided according to their difficulty levels and the expertise required.

By contrast, using "interest" as a criterion for dividing labor might lead to mismatched roles and inefficiencies, as personal interests do not necessarily align with organizational needs or competencies. This method does not provide a systematic approach to ensure that tasks are completed efficiently and effectively, thereby distinguishing it from the other established methods in labor division.