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.

By Alison Petersen March 25, 2025
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By Alison Petersen February 11, 2025
This post is for the primary families (although the families of older students who read it will readily agree and support the points below – ask them when you have a chance!). Some of you were originally drawn to Montessori because you’ve read about how different and special the approach is. Some of you were looking for a high-quality daycare or preschool and stumbled upon us. There are a plethora of reasons families choose to send their children to Montessori schools. The vast majority of those families are thrilled with their decision once they see how their child is nurtured, encouraged, and celebrated in our environments. Something interesting tends to happen sometime around when the child approaches kindergarten and first grade. Families feel the pull of traditional schooling. They begin to worry that the differences that make Montessori so wonderful just won’t cut it when it comes to preparing their older child for life. They may have excellent public school options available to them. It can be hard to go against what you did as a child, or what your family or friends are doing for their children. And we fully recognize that the decision is incredibly personal. What we can tell you is that many families who choose to leave Montessori before their child enters kindergarten end up returning. We can also tell you the three-year cycles in our environments are intentional, and there are some great reasons to give your child the gift of that third year. Feeling on the fence? Hopefully we can help clarify some of the reasons we think kids do best when they have the opportunity to complete their primary cycle. Mastery of Skills The third year in a Children's House classroom is a chance for students to really shine academically. Everything they have been working on comes full circle and their understanding of concepts solidifies in a way it couldn’t have until now. Much of what we teach in the earlier years of our primary environments is indirect and direct preparation for the lessons our third years receive and the materials they work with. Not only are our kindergarten children understanding concepts in new ways, but they can actually demonstrate this knowledge. Educators from all backgrounds will agree that when a person is able to teach someone a skill, they have themselves demonstrated mastery of the skill. Our classrooms are designed so that older students help to teach younger ones. This teaching serves multiple purposes, one of which is to demonstrate their own understanding. One of the many benefits of the multi-age classroom, our kindergarteners really enjoy taking on the role of giving lessons to their younger peers. Opportunities for Leadership Teaching lessons to younger children isn’t just about academic mastery; it’s also a chance for kids to experience leadership. We believe that solid leadership isn’t really about power. It’s about allowing those with experience to take on a role of guiding others with less experience. So much of this type of leadership is done by modeling, and our kindergartners serve as the very best models for our younger students. When your child first entered the classroom, they went through a period in which they needed to figure out expectations, routines, and so much more. Children need to learn how to be independent, how to interact with one another and adults, how to care for the environment, and so on. As adults who guide the children, we model and verbalize what children need to learn, but we are wise enough to recognize that they learn more from watching their peers. Older children relish in this opportunity. It feels good to know that you are helping someone else. It feels good to acknowledge how far you have come, and how you are now able to guide others along their own path. Our third years know about this role because we discuss it with them often. By the time they step into it, they are more than prepared. Continued Respect for Individuality You already know that Montessori schools respect each child’s individual path, and that we believe even young people deserve to be treated with dignity. There are many ways in which we differ from conventional institutions, but some that we think are important to highlight are: Allowing the child to use the restroom when they need to, without having to ask permission from an adult Encouraging children to eat a snack when they are hungry and drink when they feel thirsty Creating a structure that allows children to take breaks when they need to, and to focus deeply on their work for long periods of time without being interrupted Giving children academic choice within limits (they may be required to complete certain tasks, but it’s okay if they choose the order in which the tasks are done) Creating flexible seating choices so that children have options to sit alone or with friends, in a chair or on the floor Advanced Academic Expectations Parents in our community often recognize that our curriculum tends to exceed the scope of what is taught elsewhere. We do not push children to learn what is beyond their capabilities, we just know that children are capable of more than most people realize. When given the opportunity, they can amaze us all. We honor the fact that every single child develops at their own rate, and there is no set time for various skills to be mastered. It is not uncommon, however, for Montessori students to: Be reading before they enter kindergarten Be working with numbers into the thousands at age four Have an understanding of basic grammatical principles at age five Engage with basic geometry concepts not typically introduced until years later Enjoy skills and content taught in the areas of biology and geography beginning at age three Learn cursive handwriting before entering elementary school Begin adding large numbers and have a basic understanding of exchanging for tens Deep-Dives Into Areas of Personal Interest One of the best parts of being in a Montessori classroom is being allowed the time to explore one’s own interests. Because of the flexible nature of the day, kids can practice various skills while learning about what creates a spark for them. Are they into dinosaurs? We provide books, paper, and art supplies for them to write about and draw diagrams of these ancient creatures. Are they proud of their family’s culture and heritage? We make space for children and families to give presentations and share their traditions. Do they dream about being a vet as an adult? Older children may be given more responsibilities to care for class pets, and they often find creative ways to connect the zoology curriculum to the animals they know and love in real life. In a Montessori classroom, the possibilities really are endless. The experience is unlike anything that can be found in other educational settings, and each year we can give our children a Montessori education is a gift. Still have questions? Please don’t hesitate to reach out and let us know how we can support you and your child.