The Planes of Development

March 24, 2022
I have found that in his development, the child passes through certain phases, each of which has its own particular needs. The characteristics of each are so different that the passages from one phase to another have been described by certain psychologists as ‘rebirths’.
Dr. Maria Montessori

Throughout her years of observing children across a wide variety of settings, Dr. Maria Montessori noticed certain undeniable patterns in their development. She fully recognized that there are many variances among individuals but stated that there were certain traits that could generally be relied upon as children grow and age. She believed that these traits and characteristics could be used not only as a marker to determine a child’s developmental phase, but also as a guide for the adults who serve the child. 


As Montessori educators, we still use her scientific findings in our work today. Dr. Montessori recognized that childhood development is divided into four main phases, or planes. Each plane builds upon what was learned in those previously, and each plane has both an active and passive phase. By fully understanding the developmental needs of a child — wherever they happen to be on this continuum — we are better able to create an environment that will be optimal to support their further development.


There is so much to say about Montessori’s planes of development; we will keep it brief and highlight the main points. Just as we utilize this information in our learning environments, we encourage parents to consider how your child’s developmental traits might inform your own decisions at home. Is there anything you’re already doing that supports their growth? Is there anything new you might try?

The First Plane of Development
Newborn-Age 6

During the first plane of development, children learn primarily through experiences they have with their environment. The personal growth during this period is unlike anything we see for the rest of our lives. This is a time of tremendous physical growth, but also the development of the personality. Some of the most important traits to be aware of:

  • The need to feel safe and secure
  • A desire for physical autonomy
  • Exploration and refinement of the senses
  • Development of gross and fine motor skills
  • Desire to work independently or beside peers (as opposed to with them)
  • Concrete thinking 
  • A tendency toward neatness and order

From birth to about age 6, the child’s motto is essentially: “Help me to do it myself.”


The Second Plane of Development
Ages 6-12

Around age 6, there is a definitive shift in the child. There are a series of physical growth spurts, as well as an insatiable need for knowledge about the world and universe. The child’s world begins to expand beyond the narrow perimeters of themselves. This means they are more social, but also curious about everything beyond what they already know. Keep the following characteristics in mind: 

  • This is a time of big imaginations!
  • The child’s thinking moves from concrete to abstract
  • The cultural subjects (science, geography, & history) are of great interest
  • Kids often prefer BIG work at this age
  • They crave social interactions but are still learning how to navigate them appropriately
  • They aren’t always aware of their growing limbs and often fall/knock things over
  • Neatness and order are not important, and often forgotten
  • Justice and fairness become critically important

Kids at this age just want to devour all the information they possibly can. It is our job to help them learn to “think for themselves”.


The Third Plane of Development
Ages 12-18

The third plane is a magical time. Adolescents find themselves in the developmental stage in which they are learning who they are as individuals. Although we change continuously throughout our lives, who we are at our core, and what drives us is usually anchored in the discoveries we make during our teen years. The onset of puberty brings enormous physical and emotional changes, and the variability between peers during the first half of this plane is obvious. Important points to remember:

  • Teens are thinking about their futures
  • They need nurturing and emotional support much like first plane children
  • Having information about puberty will help them as they experience it
  • They rely heavily on peers, but still need adult support (even as they seem to reject it)
  • Emotions will fluctuate dramatically
  • Adolescents need respect 
  • Physical work is often more important than intellectual pursuits

Adolescence can be a challenging time for teens and the adults in their lives. There is a constant pushing away and pulling toward one another, and as adults we can work to stay consistent and support their growing independence. This is also an important time to remember that teens are developing their sense of who they are and what they will become; their ideas for their future may look different from what we may have envisioned for them, and that’s okay!


The Fourth Plane of Development
Ages 18-24

Yes – Montessori considered ages 18-24 the final stage of child development! Perhaps you are still in this plane yourself, or not that far out of it. Perhaps you have children approaching this plane. Late adolescence into early adulthood is the bridge that connects our childhood selves to the rest of our adult lives. The rapid growth and learning that goes on during this time period is critical to supporting our future selves. 

People in the fourth plane of development are striving toward full independence. This may mean moral independence, financial independence, and emotional independence. At this age we tend to evaluate our own personal place in society. We think about how we will contribute to the greater good, and what our path will look like moving forward. We develop personal interests, start our careers, and sometimes even begin families of our own.

Dr. Maria Montessori stopped writing about human development at the fourth plane. One has to wonder, what would it look like if she had continued? How might human development be classified and defined as it moves through the years? How could Montessori philosophy be applied to adult life?

Want to learn more? Take a look at any one of these helpful resources:


Association Montessori International – The Child’s Development
The Four Planes of Development by Camillo Grazzini
 
Association Montessori Internationale – Planes of Development Quotes
 

October 26, 2026
When Dr. Maria Montessori began developing her curriculum for elementary-aged children, she recognized that their educational needs undergo a profound transformation. Academic skills become more complex, but more importantly, the way content is delivered must fundamentally shift. In the elementary years (ages 6–12), children transition away from the sensory, hands-on physical boundaries of early childhood and move toward an expanding intellectual horizon. Around age six, a child’s scope of vision expands exponentially beyond themselves. Social connections become paramount, a vivid imagination awakens, and a deep curiosity takes hold regarding the universe, society, and their own place within the big picture. To meet this developmental leap, Dr. Montessori created Cosmic Education—a holistic framework that presents the story of the universe and humanity’s interconnected role within it. The Five Great Lessons: Springboards for Imagination At the heart of Cosmic Education are the Five Great Lessons. These are not intended to be exhaustive academic lectures; rather, they are dramatic, impressionistic stories designed to ignite the child's imagination and serve as a springboard for all future research and learning. Because children spend three years in each elementary community (Lower Elementary: ages 6–9; Upper Elementary: ages 9–12), they experience these lessons three distinct times. Each year, as their cognitive capacity grows, the lessons reveal deeper layers of meaning, sparking fresh, student-led exploration in chemistry, history, mathematics, language, and the sciences. Great Lesson 1: The Creation of the Universe Typically presented at the start of the school year, this lesson offers a captivating sense of wonder. Guides intentionally prepare the atmosphere: drawing the blinds, dimming the lights, and gathering children around a series of impressionistic materials and science experiments. The story begins in the vast, cold darkness before the universe existed, building up to the instantaneous moment of creation. Through striking demonstrations, children observe: How particles moved together and apart The speed of light and the immense scale of stars States of matter (solids, liquids, gases) The formation of the solar system, the cooling of the Earth, and volcanic activity Follow-Up Studies: This lesson serves as the gateway to physics, chemistry, astronomy, geology, physical geography, and the scientific method. Great Lesson 2: The Coming of Life As the school year progresses, attention shifts to how life emerged on Earth. To help elementary students grasp deep time, guides utilize impressionistic visual materials: The Long Black Strip: A long runner of black fabric representing Earth's vast lifespan, ending with a tiny sliver of white to represent all of human history. This material provides a humbling visual perspective on our planet's timeline. The Clock of Eras & The Timeline of Life: Colorfully illustrated charts detailing life’s evolution from single-celled organisms through early plants, invertebrates, vertebrates, and dinosaurs. Follow-Up Studies: Children dive into biology, Botany, Zoology, the five kingdoms of life, vertebrate classification, and paleontology through fossil studies. Great Lesson 3: The Coming of Humans This lesson introduces early human ancestors and the arrival of human consciousness. Children reflect on what makes human beings unique—our ability to think, reason, feel deeply, and collaborate to invent tools that solve complex problems. Guides introduce the Fundamental Needs of Humans, demonstrating how all people throughout history and across cultures share the exact same core requirements for survival and fulfillment (shelter, nourishment, clothing, defense, spiritual expression, and art). Follow-Up Studies: Ancient history, cultural anthropology, world geography, social studies, and human migration patterns. Great Lesson 4: The History of Mathematics Elementary students are fascinated to discover that mathematics was not created out of thin air, but was invented by ancient civilizations to solve real-world problems, like measuring land, trading goods, and tracking time. By learning about the contributions of the Babylonians, Egyptians, Greeks, Mayans, and early Indian mathematicians who developed the concept of zero, children realize that numbers are a shared human heritage. Follow-Up Studies: When children work through subtraction, long division, or geometry, they ground their practice in historical context, making abstract math deeply meaningful and engaging. Great Lesson 5: The History of Language Similar to the history of math, this lesson illuminates how written language evolved. From early cave paintings and Egyptian hieroglyphics to the Phoenician alphabet and the printing press, students learn how humans captured spoken thoughts to communicate across distance and time. Follow-Up Studies: Because elementary students are actively refining their reading, grammar, creative writing, and research skills, understanding the origin of words (etymology) inspires pride and curiosity in their literacy work. Experiencing Cosmic Education at MSL Cosmic Education gives children a sense of purpose and belonging. Instead of delivering isolated facts, Montessori presents the whole universe first, allowing students to see how every detailed subject connects back to the grand story of life. Would you like to observe our Lower and Upper Elementary classrooms in action and see Cosmic Education at work? Schedule a tour today!
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