If this is for a group, then i can think of quite a few things:
1) number of space characters to indent
2) targeted size of a method (try to have no more than 24 lines
in a method)
3) no import on demand rule
4)
testing methods standards
5) what features will not be used
6) what library features / methods will not be used
7) what documentation must be completed when the standards are
not followed.