Montessori & Piaget: A Comparison

Both Dr Maria Montessori and Jean Piaget offered powerful ways of understanding how children grow, think, learn, and interact with the world around them.

Piaget, a psychologist, is widely known for his Stages of Cognitive Development. His work is often referenced in education because it gives adults a helpful framework for understanding how children’s thinking changes over time.

Montessori, an educator and physician, developed what she called the Planes of Development. Her work is equally useful for parents, teachers, carers, and anyone involved in supporting children. Montessori’s view of development places great emphasis on observation, independence, the prepared environment, and the child’s natural drive to learn.

Although Montessori and Piaget used different language and focused on different aspects of development, both recognised that childhood is not one single phase. Children pass through important developmental periods, and each period has its own needs, sensitivities, strengths, and learning opportunities.

This article offers a simple comparison between Montessori’s Planes of Development and Piaget’s Stages of Cognitive Development.

Two Ways of Understanding Childhood

Piaget believed that children can only accomplish certain forms of thinking when they are psychologically ready to do so. Through observation, he grouped children’s cognitive development into four stages according to approximate age.

Montessori also believed that children pass through distinct stages of development. She called these stages Planes of Development. Montessori described four planes in total, with the fourth plane representing adulthood. The first three planes cover the years before adulthood and each lasts approximately six years.

Montessori also believed that within each plane there is a rhythm of growth. The first three years of a plane tend to involve intense change and acquisition. The second three years allow the child to stabilise and consolidate what has been gained.

Both thinkers therefore saw development as a journey. However, Montessori’s work focuses more directly on how adults can prepare the environment to support the child’s independence, while Piaget’s work focuses more on how children’s thinking changes as they mature.

Piaget’s First Stage and Montessori’s First Plane

Piaget’s first stage is called the Sensorimotor Stage. This stage begins at birth and lasts until around eighteen to twenty-four months.

During this period, infants learn through movement, sensation, reflexes, repetition, and interaction with their immediate environment. Piaget divided this stage into six sub-stages.

Simple Reflexes: Birth to Six Weeks

In the earliest weeks of life, infants respond to the world through reflexes such as sucking, grasping, and turning towards light or sound. Piaget believed these early patterns of action form the beginning of intellectual development.

He used the term schema to describe a child’s developing understanding of objects, people, and experiences. A child’s schema develops through two important processes:

Assimilation — taking in new information through experience.
Accommodation — adjusting existing understanding based on what has been experienced.

Primary Circular Reactions: Six Weeks to Four Months

At this stage, infants begin repeating actions that were first accidental. Their focus is mainly on their own body. For example, an infant may repeat a movement because it feels interesting or creates a pleasurable sensation.

Secondary Circular Reactions: Four to Eight Months

During this stage, infants become more interested in the effect they can have on objects outside themselves. They begin exploring the environment more actively and repeat actions that produce interesting results.

Coordination of Secondary Circular Reactions: Eight to Twelve Months

At this stage, infants begin to act more intentionally. They start to understand that a pattern of actions can lead to a desired result. Piaget also believed this was the period when infants begin to develop a clearer understanding of object permanence.

Object permanence is the understanding that something still exists even when it cannot be seen.

Tertiary Circular Reactions: Twelve to Eighteen Months

At this stage, infants and toddlers experiment more actively. They may repeat actions in different ways to see what happens. A child may drop an object from different sides of a high chair, not simply to be difficult, but to explore cause and effect.

Internalisation of Schemas: Eighteen to Twenty-Four Months

By the end of the sensorimotor stage, toddlers begin to create mental images of their environment. They no longer rely only on the physical presence of an object or person. Language also begins to develop more rapidly, and children may begin putting words together.

Object Permanence and Later Questions

Piaget’s work on object permanence was highly influential. He believed that infants under a certain age did not fully understand that an object still existed once hidden.

Later researchers questioned whether object permanence may develop earlier than Piaget first suggested. Some later experiments indicated that younger infants may understand more than they can physically demonstrate. In other words, an infant may know that an object still exists but may not yet know how to search for or retrieve it.

This is a helpful reminder for parents and educators: children may understand more than they can express or act upon.

Montessori’s First Plane: The Absorbent Mind

Montessori’s first plane of development covers birth to six years. She divided this plane into two sub-planes:

Birth to three years — the unconscious absorbent mind.
Three to six years — the conscious absorbent mind.

Montessori believed that the young child has a unique capacity to absorb from the environment. She called this the Absorbent Mind.

This does not mean that the child is passively copying everything around them. It means that the child is forming personality, language, movement, habits, order, and understanding through direct experience with the environment.

Montessori believed this kind of learning is unique to early childhood. The young child absorbs language, movement, culture, routine, and behaviour with extraordinary intensity.

Sensitive Periods

Montessori used the term sensitive periods to describe times when a child is especially drawn to developing a particular skill or area of understanding.

During a sensitive period, a child may focus deeply on one type of activity. They may repeat it often, return to it again and again, and seem almost driven to master it.

Examples of sensitive periods commonly associated with Montessori education include:

• Movement
• Language
• Order
• Small objects
• Refinement of the senses
• Grace and courtesy
• Music
• Writing
• Reading
• Mathematics
• Spatial relationships

A child who repeatedly carries, pours, stacks, sorts, touches, listens, repeats words, or studies tiny details may be showing signs of a sensitive period.

For example, a toddler who becomes fascinated by ants, small stones, buttons, or crumbs may be moving through a sensitivity to small objects. To an adult, this may seem insignificant. To the child, it may be a deep moment of concentration and discovery.

Movement, Order, and the Senses

Montessori placed great importance on movement. At first, a baby’s movements may appear uncoordinated. Over time, through practice and the right environment, movement becomes more refined and purposeful.

This is why Montessori environments offer children real opportunities to move, carry, pour, wash, sweep, climb, build, and handle objects with care.

Montessori also observed that young children often have a strong need for order. Predictable routines, familiar places for objects, and a calm environment can help the child feel secure.

The senses are also central. Young children learn through touch, taste, smell, sight, and hearing. They do not learn only by being told. They learn by experiencing.

Piaget’s Second Stage and Montessori’s First and Second Planes

Piaget’s second stage is called the Pre-operational Stage. It occurs roughly between the ages of two and seven.

During this stage, children develop symbolic thinking and language. They can use words, images, pretend play, and imagination to represent objects and experiences.

However, Piaget also believed that children at this stage struggle to understand other people’s points of view. He described this as egocentrism. His Three Mountains experiment with Bärbel Inhelder was used to support this idea.

Later research questioned whether Piaget underestimated young children’s ability to understand another person’s perspective. For example, Hughes’ Policeman Test suggested that younger children may be able to decentre when the task is more familiar and meaningful to them.

This shows an important point: children’s abilities can be affected by how a task is presented. A child may appear unable to do something in one setting but show greater understanding in another.

Montessori’s View of the Three-to-Six-Year-Old Child

Montessori did not describe the child of this age as simply egocentric. Instead, she saw the three-to-six-year-old child as becoming more conscious, purposeful, and independent.

This is the age where children often say:

“I want to do it by myself.”

For Montessori, this desire for independence is not defiance. It is development.

Children at this age need real opportunities to participate in everyday life. This is why Montessori encouraged adults to provide child-sized versions of real household tools:

• Small jugs
• Child-sized cutlery
• Real plates and cups
• Small dustpans and brushes
• Low shelves
• Accessible clothing hooks
• Simple food preparation tools
• Small cloths for wiping spills

Montessori preferred real materials over pretend ones where possible. Children learn dignity, responsibility, care, and skill when they are trusted with real work at the right level.

Montessori’s Second Plane: Six to Twelve Years

Montessori’s second plane covers approximately six to twelve years of age.

By this stage, the child is usually more physically coordinated, more socially aware, more fluent in language, and more stable in personality. Montessori believed that the child no longer has the absorbent mind in the same way as the younger child.

Instead, the child now learns through:

• Reasoning
• Imagination
• Logic
• Social interaction
• Exploration
• Questions
• Moral understanding

This is the age of “why,” “how,” “when,” and “what if?”

Children in the second plane often want to understand systems, relationships, rules, fairness, nature, history, numbers, stories, and the wider world. They are ready for bigger questions and more connected learning.

Piaget’s Third and Fourth Stages

Piaget’s third stage is called the Concrete Operational Stage. It occurs roughly between seven and eleven years.

At this stage, children begin to think more logically about concrete situations. They can understand conservation, classification, reversibility, and the idea that objects can belong to sets and subsets.

However, they often still benefit from real examples, physical materials, and concrete experiences.

Piaget’s fourth stage is called the Formal Operational Stage, beginning around eleven years and continuing into adolescence and adulthood.

At this stage, young people become more capable of abstract thought. They can think hypothetically, reason about possibilities, and consider ideas that are not directly tied to physical experience.

Montessori’s Third Plane: Adolescence

Montessori’s third plane covers approximately twelve to eighteen years. Like the first plane, Montessori saw adolescence as a time of intense transformation.

This stage includes physical, emotional, social, and intellectual change. Montessori believed that adolescents need a different kind of learning environment from younger children.

She envisioned an environment called Erdkinder, sometimes described as an “earth school.” This was an educational setting connected to nature, practical work, community, and real responsibility.

Montessori believed that adolescents benefit from meaningful work, contact with the land, economic activity, social contribution, and intellectual study connected to real life.

This is very different from a model that expects adolescents to sit still under pressure for long periods while undergoing rapid physical and emotional change.

Similarities Between Montessori and Piaget

Montessori and Piaget had several important similarities.

Both recognised that children develop through stages.
Both believed children learn through interaction with the environment.
Both understood the importance of concrete experience before abstract thought.
Both valued observation.
Both saw children as active participants in their own development.

Neither viewed children as empty vessels waiting to be filled with information.

They both understood that children construct understanding through experience, movement, exploration, and engagement with the world.

Key Differences Between Montessori and Piaget

Although there are similarities, there are also important differences.

Piaget focused heavily on cognitive development and the structures of thought. Montessori focused not only on cognition, but also on independence, environment, movement, practical life, social development, and the child’s whole personality.

Piaget often described development in terms of what children could not yet do at a particular stage. Montessori tended to focus on what the child was trying to develop and how the adult could support that development.

Piaget’s theory gives adults a useful guide to how children’s thinking changes. Montessori’s approach gives adults a practical method for preparing the environment, observing the child, and supporting independence.

Piaget placed less emphasis on the social and environmental design of learning. Montessori placed great emphasis on the prepared environment and the child’s relationship with others.

Why This Matters for Parents

Parents do not need to become experts in developmental theory to benefit from Montessori and Piaget.

The important lesson is this:

Children are not small adults. They think, move, learn, and understand differently at different stages of development.

When adults understand this, they can respond with more patience, more realistic expectations, and better support.

A toddler who repeats the same action is not necessarily being difficult. They may be learning through repetition.
A young child who says, “I can do it myself,” may be asking for independence.
A six-year-old asking endless questions may be developing reason and imagination.
An adolescent who needs meaningful work and purpose may be seeking a deeper connection to adult life.

When we understand development, we stop rushing children through childhood. We begin to meet them where they are.

Conclusion

Montessori and Piaget both offer valuable insight into the developmental journey of childhood.

Piaget helps us understand how children’s thinking changes over time. Montessori helps us understand how to prepare the environment so the child can develop independence, concentration, coordination, confidence, and purpose.

Together, their work reminds us that children grow through stages, experience, movement, observation, and meaningful engagement with the world.

For parents, teachers, and carers, this knowledge is not merely theoretical. It helps us choose better materials, prepare better spaces, ask better questions, and offer support that respects the child’s stage of development.

The more we understand how children grow, the better we can help them become confident, capable, thoughtful, and independent learners.

References and Further Reading

Bruce, T. and Meggitt, C. (2005). Child Care and Education. 2nd Edition. London: Hodder and Stoughton.

Cardwell, M., Clark, L. and Meldrum, C. (1998). Psychology for A Levels. London: Harper Collins Publishers Ltd.

Montessori, M. (1972). The Discovery of the Child. New York: Ballantine.

Montessori, M. (2004). The Absorbent Mind. Oxford: Clio Press.

Montessori, M. (2002). What You Should Know About Your Child. Oxford: Clio Press.

Sharman, C., Cross, W. and Vennis, D. (2001). Observing Children: A Practical Guide. London: Continuum.