The Planes of Development
Alison Petersen • September 27, 2023

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.

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One of the many beautiful and empowering aspects of Montessori education is how it helps children understand themselves as valued members of a community. A key way this happens is through Care of the Environment, a form of Practical Life work that provides children with the opportunity to tend to the spaces they live in each day. By participating in this care, children begin to feel at home in their classroom, school, and community. They feel a sense of ownership and take pride in their surroundings, and in the process, develop a deep sense of responsibility and connection. The Outdoor Environment When considering the children’s environment, we're not just referring to indoor spaces. In Montessori, the outdoor environment is not an afterthought. Instead, we consider the outdoors to be a natural and essential extension of the prepared indoor space. For young children, who are absorbing everything from the world around them, the time spent outdoors supports development in profound and lasting ways. For older children and adolescents, outdoor spaces can be a place for self-regulation and deep focus. Now more than ever, when children tend to spend increasing amounts of time indoors, reconnecting with natural spaces is vital for physical, emotional, and cognitive health. Why Being Outdoors Matters Research, including the work of Richard Louv in The Last Child in the Woods, highlights a growing body of evidence that time spent in nature is critical to the healthy development of both children and adults. In Montessori, we recognize that outdoor time is not a break from learning. Rather, the natural world is a powerful space for movement, language, social development, and sensory integration. Time outdoors is learning time. Young children are in the midst of sensitive periods for order, language, movement, and sensory refinement. These windows of opportunity allow for an intense connection with nature that nourishes the whole child. Plus, the natural world’s beauty, order, and rhythm speak to our deepest human tendencies: to explore, understand, and belong. The Adults’ Role Outside Outdoor spaces become a rich environment for observation, guidance, and connection. Children are often more socially expressive outdoors, making this a critical time for observing group dynamics and supporting social-emotional growth. It’s also a time to model joyful, playful behavior. Children need to see that being human includes lightness and laughter, and outdoor time offers the perfect opportunity for us to play alongside children while still maintaining an appropriate level of guidance. We can also help children understand that different environments call for different behaviors. What is appropriate outdoors differs from what is expected indoors. As children gain different experiences, they come to understand how to conduct themselves with grace and courtesy on a woodland trail and a garden bed, or how to navigate the intricacies of fort building and group game dynamics. Montessori children learn to move through different scenes and scenarios with increasing awareness, sensitivity, and confidence. Setting Up Outdoor Spaces We want our outdoor spaces to feel like a true extension of our classrooms, not a break from them. As such, we are intentional about how the outdoor spaces are developmentally appropriate, deepen children’s understanding of cause and effect, and nurture a sense of order. We want activities in the outdoor space to have a purposeful intent so they support the integration of children’s will, intellect, and coordinated movement. At home, outdoor activities can provide open-ended play opportunities that encourage exploration and independence, as well as ways to involve children in purposeful projects. Here are some ideas to get started! Practical Life Provide tools for cleaning tasks: sweeping paths, washing outdoor furniture, scrubbing flower pots, washing the car, and wiping off outdoor toys. Encourage gardening: planting seeds, watering, weeding, harvesting herbs or vegetables. Offer animal care opportunities: refilling bird feeders, walking the dog, playing fetch. Sensorial Exploration Include sensory gardens with fragrant herbs, soft leaves, and vibrant flowers—like lavender, mint, and lamb’s ear—that invite children to touch, smell, and observe. Create a collection space for sticks, stones, pinecones, shells, and seed pods. Observation and Nature Study Set up bird feeders, weather tools, and insect hotels. Create small areas for quiet observation with a bench, blanket, or hammock. Add sensory elements like wind chimes or water features to create a calming atmosphere. Curricular Connections Math: count petals, measure plant growth, sort leaves by size and shape. Science: Tools like magnifying glasses and microscopes help them explore soil, insects, and plant life up close. Composting systems, rainwater collection, or native plantings foster environmental stewardship. Art: Natural materials become mediums for creativity, such as twigs for weaving, leaves for prints, and landscapes for sketching. Language: Storytelling, reading under a tree, or labeling plants and garden tools strengthens vocabulary and communication while keeping learning grounded in the real world. Observe and Adapt As with all prepared environments, the key is observation. What captures our children’s curiosity? Where are they returning again and again? What challenges are they facing? By observing carefully, we can adjust to our children’s needs and interests. A prepared environment supports the whole child and helps them feel connected, not just to the earth, but to themselves and their community.