For collaboration, I prefer Supercollaboration style, which is mainly about the following two rules:
Authorship on papers that result from supercollaboration is self-determined by each participant and generally in alphabetical order.
The unsolved problems and resulting discussion are confidential within the group, and can be shared with others only if the group agrees to it (or when the results get published).
Our (my coauthors and I) manuscripts have been rejected from the following venues. The numbers inside parentheses indicate the number of manuscripts rejected from each venue.