Can an activity assign to different users?

Hello All,

Can an activity assign to many users in a Bonita workflow project? For example I created a project namely project1 in bonita workflow having an activity namely act1 and participants are user1, user2 and user3. I saved that project and closed ProEd. I imported the project1. when I logged with user3, I would able to "start" and "ToDo" to act1. Other users(user1, user2) can start the act1 but not "ToDo". can users (user1 and users2) "start" and "ToDo" to act1 ? If yes than how? Pls reply me.

Thanks in advance.

Kind Regards,
Prashant