A Subtle Art: The Beauty of the Montessori Three-Period Lesson
Rebecca Lingo • April 1, 2024

At Wheaton Montessori School and in Montessori education all over the world, we have a subtle art for connecting children to new concepts, a technique we call the Three-Period Lesson. This structured approach is designed to introduce and reinforce new concepts in a way that works with children’s natural learning tendencies. It consists of three distinct phases, each serving a crucial purpose in the learning process. 


The First Period: Naming


At Wheaton Montessori School, we focus on helping children create an association of the item or sensorial perception with its name in this part of the lesson. This is a statement of vocabulary, but its simplicity should not disguise the great importance of this period. Proper execution is vital to success and as such our teachers execute this part of the lesson with extreme exactitude. We take great care to avoid any peripheral information which would serve only to confuse. The emphasis here is on clear articulation and repetition, allowing children to absorb the information through auditory and visual cues.


If the lesson is focused on sensorial perception, we first help a child awaken that sense before giving any vocabulary. For example, if we are introducing a very young child to the vocabulary for temperature, we use a set of thermic bottles. We first isolate the hottest and coldest of the bottles. We feel the “hot” bottle, invite the child to feel it, and state: “This is hot.” Then we have the same procedure with the cold bottle, first feeling, then stating: “This is cold.” If necessary, we may repeat the experience, associating the bottle with its attribute: “Hot…. Cold.” We take great care in pronouncing the vocabulary or attributes clearly and distinctly so that children can easily absorb the vocabulary. We also make sure to avoid any additional descriptions or explanations.


The purpose of the first period is to help children connect the sensory data stored in the right hemisphere of the brain with its precise language, stored in the left hemisphere of the brain. This neural connection fixes the perception in children’s minds and provides an index to the sensorial impression, making it accessible to the conscious mind.


The Second Period: Association


In this phase, we focus on having children recognize the object in correspondence to the language. It is a way for us to see if a child has been successful in the association of the perception with its name as presented in the first period. In the second period, we use the vocabulary in a series of lively and fun declarative commands that encourage repetition. 


For example, if presenting large and small with a cylinder block, we might ask: “Which one is large?” “Which one is small?” “Put the large one here.” “Put the small one here.” “Show me the large one.” “Point to the small one.” This activity has a game-like feel and offers children the chance to repeatedly hear the vocabulary and associate it with the corresponding attribute or object. 


During this period, we do not ask children to recall the vocabulary. Because there is active participation that reinforces the association between the name and the object or concept, this period is about reinforcement. It is the longest of the three periods and is the most important one in terms of serving as an aid to children’s memory. Every time a child hears the vocabulary and associates it with the corresponding attribute/object, it activates the necessary synaptic connections in the brain and strengthens neural pathways. 


If a child is not successful in the second stage, we have two choices: return to the first period or gracefully end the lesson and offer it again another day. It might be that a child just needs more time to work with the materials sensorially. Regardless, if the child isn’t experiencing success at this stage, we recognize that we need to 

reassociate the sensory impression with the name. We don’t point out the error to a child, though, because that only serves to embarrass the child or cause them to feel defeated. Nor is it helpful to continue with the lesson, for if the associations are not happening, more repetition would only serve to cause further confusion.


The Third Period: Recall


This last part of the lesson is just a quick test and serves as a verification that a child has successfully retained the association given in the first period. For the first time, we no longer provide the vocabulary, and instead, the child must produce it from their memory. We simply ask: “What is this?” If the child can successfully answer a series of times, then we can verify that the association has been created. If the child is not successful, we repeat the first or second period. This is not done as a means of correction, but to ensure the child leaves the material with an accurate impression. 


Once the Three Period Lesson is over, we allow children to continue working with the material. Often, we see that they have renewed enthusiasm for the material after making these new mental associations.


A Powerful Approach


By following this structured approach at Wheaton Montessori School, we provide children with multiple opportunities to engage with new information and reinforce their learning through repetition and active participation. This approach is powerful and effective for three main reasons: 


Respect for the Child's Learning Pace

The three-period lesson respects the individual pace of each child's learning journey. By breaking down new concepts into manageable steps, we cater to the diverse needs, abilities, and learning speed of each child.


Promotion of Active Engagement

Through interactive questioning and hands-on activities, the Three-Period Lesson encourages active engagement and participation. Children are not passive recipients of information but rather active participants in their learning process, leading to deeper understanding and retention.


Facilitation of Meaningful Connections

By associating new concepts with real-life objects or experiences, the Three-Period Lesson helps children make meaningful connections between abstract ideas and concrete examples. This approach fosters holistic understanding and lays the groundwork for future learning.



Above all, the beauty of the Three-Period Lesson lies in its simplicity and effectiveness. The technique is subtle yet consistent, the lessons are brief yet powerful, and the language is precise yet expansive. Ultimately, the Three-Period Lesson empowers children to become active learners, capable of exploring the world with curiosity and confidence. 


We invite you to come see this technique in action. Current families can schedule a classroom observation by using the green buttons below. 


Adolescent Seminar Observation Ms. Searcy’s Upper Elementary Classroom Observation Mrs. Fortun’s Lower Elementary Classroom Observation Mrs. Mayhugh’s Lower Elementary Classroom Observation Mrs. Berdick’s Primary Classroom Observation Ms. Carr’s Primary Classroom Observation Ms. Chiste’s Primary Classroom Observation Mrs. Rogers’s Primary Classroom Observation

We are enrolling children who will be between 2.5 and 4 for summer and fall 2024 start dates. Prospective families are invited to schedule a school tour by clicking on this link or the green Schedule a Tour button on the upper right-hand corner of this page.  


A child working with number rods on a mat. Text: After Number Rods: Growing a Felt Understanding of Mathematics.
By Kelly Jonelis and Rebecca Lingo November 3, 2025
In Montessori classrooms, mathematical understanding begins long before symbols or equations appear. It begins in the body. When young children carry Number Rods—red and blue wooden bars of increasing length—they are not merely learning to count. They are internalizing what quantity feels like. The rods show quantities in a fixed, linear, and measurable form—not loose, individual, or separate units. This difference is subtle but powerful. In many conventional early math settings, children are shown three buttons or four apples and asked, “How many?” Montessori children certainly have those experiences too, through materials like Cards and Counters. But the Number Rods introduce something more abstract: quantity as something continuous and measurable. A rod of six is one solid piece, not six separate ones. It represents a fixed magnitude that can be compared, combined, or measured—laying the foundation for the number line, for operations, and for the idea that numbers express magnitude as well as count. “This concept can be compared to an eight-ounce glass of water: you don’t have eight separate ounces, you have a glass that is eight ounces. It’s a whole quantity, not a sum of parts. Likewise, the Number Rods offer children an experience of number as a unified magnitude. The “six” rod is not three twos or two threes; it is simply six. That understanding, that a number can be both composed and whole, bridges a crucial conceptual gap for later mathematics.” Kelly Jonelis, Adolescent Program Director and Math Teacher Through countless experiences—carrying, comparing, building stair patterns, and making “ten combinations”—children begin to feel relationships between numbers. They see that five is longer than three by exactly two, and that these relationships are consistent and reliable. This concrete sense of equivalence and proportion quietly becomes the basis of estimation, measurement, and algebraic thinking. Even extensions like “memory games” or exploring one meter in length serve a larger purpose. The child’s repeated interactions with fixed quantities help them internalize what Montessori called “materialized abstraction.” They are learning, through movement and perception, what it means for a quantity to exist in space and time—a step far deeper than counting individual items.
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