My primary form of communication is email. I use email so much that it actually baffles me when I meet someone who does not even have an email address.
I am an avid user of instant messaging, such as Skype. When I am collaborating on a project, it is so nice to ping someone on IM and make decisions that move the project forward.
I reserve phone calls for brainstorming sessions. I like to talk things out when we are planning and developing a strategy. I also appreciate phone calls for problem solving.
My communication methods demonstrate
Cooperation: working together in all ways to accomplish the common goal.