There are usually restrictions on the number of main participants, generally 5- 10, and the number of joint research groups is 8- 10. If the maximum number of participants is not exceeded, you can add new research members, but only if you need to report and apply for changes. Of course, with the continuous development and maturity of discipline research, all aspects of policies are broader or more open, giving discipline applicants more choices. Of course, there may be no specific limit to the number of main participants, but it should not be too many.