Google Groups, set up as a discussion board, can be a great way to collaborate on your program business plan. To get set-up with a Google Groups account for your program team, contact IT. Be sure to request the WEB FORUM version of Google Groups.
For best results, the admin/manager of Google Groups for your team should set the email settings to ABRIDGED for all team members. (To set this up the admin/manager should go into the Group. Click "Manage." Check the boxes next to all members of the group. Click "Actions" and then "Change delivery settings." Click "Abridged.")
For smaller groups (10 or fewer), try Google Hangouts. Conference calls may also play a role.
Once you are further along in the process, the AgPlan tool also allows for "reviewers" who can comment and/or edit your plan. These can be members of your program team and/or administration. Learn how to set up and communicate with a reviewer here. (You have to be logged in to AgPlan to access this information.)