1. master plan: describe some contributions and responsibilities of each author in the whole paper writing process. For example, which chapters each author is responsible for, and whether there are other main responsibilities such as literature research and experimental design.
2. Writing process: describe the role of each author in the writing process of the paper. This may include who is responsible for writing the first draft, who modifies and edits each part, and who coordinates the whole writing process.
3. Responsibilities: Describe the specific responsibilities of each author when completing the paper, such as experiment, data analysis, chart making, literature research, etc.
In short, a good division of labor should clearly explain the specific tasks of each author to prevent unnecessary loopholes or confusion. At the same time, it can also make each author have a clearer understanding of the structure and content of the whole paper, thus improving the quality of the paper.