x
I wouldn't go over three unless it was some mondo monster project. It could be handy if one of your authors is already known by the journal editors. The order of the authors should reflect who's driven the research the most.
x
Settle it internally before submitting. Typically the ones who contributed most to the conceptual content (rather than those who did the legwork) need to come first. The "coffee time" authors really should be mature enough to live with not having their names listed.
typically the first name is the main author. the supervisor is normally the last name I think.
number of authors no diff
typically the first name is the main author. the supervisor is normally the last name I think.
number of authors no diff