If part of the paper was done by a previous team member, for example, they should be on the author list, but you will also need to contact them to involve them in the writing or editing process of the manuscript. Several academic journals require authors to state the role of each author in the development of a paper, which typically includes activities such as designing experiments,
gathering data, and writing manuscripts. The popular database Contributor Roles Taxonomy (CRediT) of the Alliance for the Advancement of Standards in Research Management Information (CASRAI ) defines 14 levels of participation, and any author may play multiple roles. Systems such as ICJME guidelines or CRediT roles can help you clarify who has a place on the author list, but there are a few cases where it can be more difficult to judge. What if the research is part of a mega collaborative project?
Manage long lists of academic authors The list of authors has tended to get longer in recent years. In biomedical publications indexed by MEDLINE/ PubMed (nih.gov) , the length of author lists of academic papers has increased from three to six since the 1980s. The situation in physics is more extreme. Large collaborative projects, such as particle physics research, have grown author lists into the thousands.