The Planes of Development

Montessori Thrive

Maria Montessori based her entire educational philosophy on the idea that children developed through a series of four planes. Each of these planes is easy to recognize and has clear, defining characteristics. If we study and understand these stages, we can approach our interactions with children with a new perspective. 

Learning about the planes of development isn’t just for Montessori educators. Understanding your child’s development can help at home, too. 


The First Plane: birth-6 years


During this stage children absorb everything like sponges. They are, indeed, excellent examples if what Montessori called ‘The Absorbent Mind.’ This is a time in which we are able to utilize what Montessori called sensitive periods of learning. While each child is different, there are typical patterns that emerge in regards to brain development and general readiness to learn particular skills.


During the first three years of this plane, all learning is done outside of the child’s conscious mind. They learn by exploring their senses and interacting with their environment. During the second half of the plane, from about 3-6 years, children enter the conscious stage of learning. They learn by using their hands, and specialized materials in the Montessori classroom were developed with this consideration.


During this time, children have a wonderful sense of order. They are methodical and can appreciate the many steps involved in practical life lessons in their classrooms. The organization of the works on their classroom shelves is intentional, which appeals again to this sense of order.


The first plane is a time in which children proclaim, “I can do it myself”; it is a time of physical independence.


The Second Plane: 6-12 years


During the elementary years children begin to look outside themselves. They suddenly develop a strong desire to form peer groups. Previously, during the first plane, a child would be content to focus on their own work while sitting near others. In the second plane, a child is compelled to actually work with their friends. It is during this time that children are ready to learn about collaboration.


During the second plane there is a sudden and marked period of physical growth. This may be a contributing factor to the observation that many children of this age seem to lack an awareness of their body, often bumping into things and knocking things over. Children begin to lose their teeth around this time as well. Their sense of order and neatness tend to fade a bit during this plane.


Throughout the second plane, children’s imaginations are ignited. Since Montessori education is based in reality, we find ways to deliver real information to children through storytelling and other similar methods. For example, when teaching children about the beginnings of our universe, Montessori schools use what is called a Great Lesson. The first Great Lesson is a dramatic story, told to children with the use of props, experiments, and dramatics (think: a black balloon filled with glitter is popped to illustrate the Big Bang, with bits of paper in a dish of water used while talking about particles gathering together). This lesson is fascinating for children in the way it is presented, but gives them basic information about the solar system, states of matter, and other important concepts.


Children in the second plane have a voracious appetite for information, and are often drawn strongly to what we in Montessori call the cultural subjects: science, history, and geography. While we support their rapid language and mathematical growth during this time, we are also responsible for providing them with a variety of rich cultural lessons and experiences.


It is important to note that children develop a sense of moral justice at this time. They are very concerned with what is fair, and creating the rules to a new game is often as important (if not more so) than playing the actual game itself.


This is the period of time in which children are striving for intellectual independence.


The Third Plane: 12-18


The third plane of development encompasses the adolescent years. During the second plane, children become aware of social connections, but in the third plane they are critical. During this time children rely heavily on their relationships with their peers. They feel a strong desire to remain independent from adults, although they are not quite ready to do this entirely. It is our job to find ways that allow them to experiment with independence while also providing a safe structure in which they may do so.


Children in the third plane tend to require more sleep, and they sleep later than when they were younger. They long for authentic learning experiences, and Dr. Montessori imagined just that. Her ideas of Erdkinder (children of the earth) led her to contemplate a school setting that would support children’s development during this time. She imagined a farm school, in which children would work to keep the farm operational, but also contribute to planning and decision making while doing so. 


During the third plane children are refining their moral compass while developing a stronger sense of responsibility.


The Fourth Plane: 18-24



The final plane is a time in which young adults are striving for financial independence. They are often living away from home for the first time, and use this time to figure out where they fit into their society. Many make choices to further their education and/or explore career paths.


It is during the fourth plane that people begin to develop a truer sense of who they are as individuals.


Each plane of development should be mindfully nurtured. If a child is able to experience one developmental phase in a rich and carefully prepared environment, they are ready to fully take on the next phase when it is time.

By Ms. Mackenzie June 2, 2026
Buddy classrooms are where students from different classrooms regularly come and go to work and learn together in shared spaces throughout the school. In this setup, they interact with one another, creating a more dynamic and collaborative environment. We also have mixed ages inside the classroom, which allows younger and older students to learn from each other, build relationships, and develop important social and leadership skills.  In a Montessori environment, one of the most powerful and unique aspects of learning is the natural collaboration that occurs between children of different ages. Unlike traditional classrooms that separate students strictly by grade, Montessori classrooms are intentionally designed to foster connection, mentorship, and shared discovery. At AIMS, this philosophy comes to life in meaningful and inspiring ways as older children regularly work alongside younger ones, whether through reading together or demonstrating classroom materials, often referred to as “works.” When older children read to younger students, the experience goes far beyond simple storytelling. For the younger child, it provides a model of fluent reading, builds listening skills, and nurtures a love for language. There is something deeply engaging about hearing a story from a peer: it feels accessible, relatable, and exciting. Younger students often look up to older ones, and this admiration naturally increases their motivation to learn and grow. For the older child, the benefits are equally significant. Reading aloud strengthens comprehension, fluency, and confidence. It also requires patience and awareness, as they adjust their pace and tone to meet the needs of their younger audience. In these moments, older students step into a leadership role, developing empathy and a sense of responsibility. They begin to see themselves not just as learners, but as contributors to their community. Another beautiful aspect of this cross-age interaction at AIMS is when older children present works to younger students. These demonstrations might include showing how to use a specific material, explaining a concept, or guiding a younger child through a hands-on activity. For the younger child, this peer-led introduction can feel less intimidating than adult instruction. It encourages curiosity and invites them to explore new challenges with confidence. Meanwhile, the older child deepens their own understanding by teaching. Explaining a concept requires clarity of thought and reinforces their knowledge in a lasting way. It also cultivates pride and ownership in their learning journey. They begin to recognize that mastery is not just about completing a task, but about being able to share it meaningfully with others. At AIMS, these interactions are not forced, they grow organically within a carefully prepared environment. Teachers guide and support the process, ensuring that each child is both challenged and nurtured. The result is a vibrant community where collaboration replaces competition, and learning becomes a shared experience. Ultimately, the relationship between older and younger children in a Montessori setting reflects a broader life lesson: we learn best when we learn together. Younger children gain inspiration, guidance, and confidence, while older children develop leadership, empathy, and a deeper understanding of their own abilities. It is a dynamic, reciprocal process that enriches everyone involved, and it is one of the many ways AIMS creates a truly meaningful educational experience.
By Ms. Kilpatrick May 19, 2026
“To confer the gift of drawing, we must create an eye that sees, a hand that obeys, a soul that feels; and in this task, the whole life must cooperate. In this sense, life itself is the only preparation for drawing. Once we have lived, the inner spark of vision does the rest.” –Maria Montessori