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The Three Period Lesson

The three period lesson is an integral part of the Montessori curriculum. This lesson was originated by Edouard Seguin during the mid-19th century in France. The three period lesson is used in the 3-6 classroom to help children learn a variety of vocabulary including color names, numeral names, sandpaper letter sounds, and sight words.

Key Sounds

There are 40 key sounds, or phonemes, taught in the Montessori early childhood classroom. 24 are represented by one symbol and 16 by a double symbol.

The three period lesson is used to introduce and practice these sounds with the sandpaper letters.