Communication: We will communicate with each other by actively speaking and asking questions to one another.
Equal Understanding: We will make sure everyone in the group understands all parts of the the project by clearly explaining all of our duties, and asking questions whenever we need to.
Decision Making: We will make decisions by first making a suggestion, and then checking to see if everyone agrees/is okay with it.
Holding Each Other Accountable: We will make sure we all do what we say we will do by frequently checking on each other's work, and being sure to catch anyone up who is behind.
That's an example of what you can say^! Obviously you can add whatever comes to mind, or reword it in whatever way you see fit : )