In Toddlers through Elementary concepts are presented to the children through concrete, manipulative materials. Names of objects, concepts, and processes, are given to the children through three-period lessons. The three-period lesson is given to the child after he has had a sensorial experience with the materials.

The three-period lesson involves three steps, using two or three objects, qualities, or concepts to start.

First Period: Giving Information. This is an introduction. The adult supplies the name, which allows the child to associate the name with what is being presented.

Second Period: Familiarization. The second period consists in recognition of the object corresponding to the name. The child becomes familiar with what is being presented through repetition. The child comes to associate the name with the object or quality. This is the longest and most important period, as the subconscious is relating and recognizing the names with what is presented.

Third Period: Verification (Test of Knowledge). This is the period of mastery and a test. This is a rapid verification of the name or concept given in the first period. The guide elicits the information from the child.