There are around 350+ Montessori Schools in the United States. So it becomes very important for you to know what the guidelines and essential elements of Montessori Education.
Although there are many Schools under the name of Montessori, but you must know whether this Schools are following the guidelines of Montessori Education.
The Imagination Childcare has prepared an Infographic that details the essential elements of Montessori school. The Association Montessori Internationale (AMI) and the American Montessori Society (AMS) cite these elements as essential.