The Communication Matrix is a researched based assessment tool where you answer yes and no questions about how your student communicates. The tool then creates a visual matrix hi lighting communication skills and showing areas of deficit in four main communication domains or "reasons to communicate": (1) refuse (2) obtain (3) social & (4) information.
I, personally, love that the matrix is easy to print out and show to the IEP team. It opens up a discussion about where the student can grow and what is most important to the entire team. While the Communication Matrix is easy to use, you can save your results and come back later, it is a tad long. There is also an option for parents to complete a form, however I find, some of the questions can be a little technical.
Overall, I think this is a great tool that allows you to assess your non-verbal to minimally verbal students in a way that opens up the team for a discussion about goals and what the student most needs to work on.