Some good Montessori teaching and training courses are infant & toddler, early childhood, elementary I, elementary I-II and secondary I taught by the American Montessori Society. Other good courses include age 0-3 and assistant to infancy taught at the Montessori Institute in Denver affiliated with the Association Montessori Internationale.
Courses taught by Montessori Northwest in Portland, Oregon are divided into ages 0-3, 3-6 and 6-12 or infancy, primary and elementary respectively. These courses and training programs have several formats from which to choose. Students can opt for summer-intensive courses for a 17-week period or spread out the training throughout the year and on weekends.