There are two major types of Montessori teacher education in the United States: (1) AMI-USA (the American branch of the Association Montessori Internationale, founded by Dr. Montessori to carry on her work); and (2) AMS (American Montessori Society, founded by Nancy Rambusch to represent Montessori in America). This article presents the results from a survey which points out what materials are highly agreed on by teacher educators from both AMI and AMS centers to be necessary and/or desirable in a Montessori Primary classroom. There is a large set of agreed-upon materials across most areas, and with Art and Science/Geography--two areas to which Montessori herself allocated little attention in discussions of the first plane of development. For other areas, when there were divergences, they stemmed from two sources: (1) materials appearing to aim too high or too low (some Math and Language materials, for example, that are for children more advanced or some Practical Life materials that are preliminary to other skills); or (2) divergent opinions as to whether the activity has a clear positive developmental purpose (the tape recorder or fantasy books, for example). (Contains 2 footnotes.)