piaget stages

If you think that your child’s brain works differently than yours, then you agree with Jean Piaget, a Swiss developmental psychologist of the early 20th century. Although famous for his groundbreaking theory of cognitive development in 1936, Piaget’s career began as a teen; he was 11 years old when he published his first research paper on an albino sparrow.

His interest in intellectual development was piqued while working as an assistant for Alfred Binet, the developer of the first IQ test. Some experts may disagree with Piaget’s four stages, but today, Piaget’s theories are still used in psychology, genetics, sociology, and education.

This article explores the four stages of Piaget’s theory of intellectual development and how caregivers and teachers can practically apply it today.  

Jean Piaget’s Theory Of Cognitive Development

According to Piaget, a child isn’t just a smaller version of an adult, but childhood is vital for human development. Piaget developed his stage theories by watching children develop and observing how their mistakes while solving problems were different in various age groups. Piaget studied children through their teens to discover their thought processes and cognitive developments. Watching his three children formed the foundation for many of Piaget’s later theories. 

Like Lev Vygotsky, Piaget also believed children developed through stages. They differed in their approach concerning social interactions and culture. Vygotsky believed social interactions were necessary for learning and development, and Jean Piaget thought even children learned through doing. He believed children construct schemas, and growth occurs through continuous adaption and expansion.

Piaget concluded that children developed cognitive skills in four consecutive stages, from birth to adulthood. The four Piaget stages of cognitive development are the sensorimotor stage, the preoperational stage, the concrete operational stage, and the formal operational stage. Although Jean Piaget believed in lifelong intellectual growth, he was adamant that the formal operational stage was the final stage of development. 

Underlying assumptions Jean Piaget made about his child development stage theory were: 

  • Each stage is qualitatively different than the previous stage, and it builds the foundation for the last stage.
  • Children go through the stages of development in the same order.
  • Children learn by themselves without peers or adults telling them what to do. The children build their knowledge based on their experience.
  • Children are active learners; they don’t need rewards to motivate them to learn.  

Piaget’s Stages Of Cognitive Development

Piaget believed intellectual development followed a sequence through four distinct stages from birth to young adulthood. Each stage had new cognitive skills and a more complex understanding of the world than the previous stage. Although Piaget admitted children could go through a stage at a different age, a child couldn’t skip one of these four development stages. 

Sensorimotor Stage: Infancy

The sensorimotor stage of cognitive development is a time of tremendous learning, development, and growth. During these early stages, from birth to two years old, infants are only aware of their immediate environment; they discover their world by their actions (touching, tasting, grasping, sucking), what they see, hear, and their physical interactions.  

Everything they learn is based on trial and error; they experience by interacting with their world using their senses and motor skills.

Substages Of Sensorimotor Stage


From birth to 1 month old, a child understands and interacts with their environment through inborn schemas, mainly looking and sucking.

Primary Circular Reactions.

From 1-4 months, babies learn to coordinate sensations as they endlessly repeat basic schemas like looking, sucking, and grasping. Although they can’t connect their physical actions with results outside their bodies, they repeat actions that they experience as pleasurable. 

Example: thumb sucking

Secondary Circular Reactions

Babies from 4-8 months of age begin to understand the object concept. Through trial and error, they become aware of results outside their body. If they’ve already mastered an action, they could purposefully imitate the action.

Example: picking up an object like a toy and putting it in their mouth

Coordination of Reactions

From 8 months to a year, children develop coordination of secondary schemas; the child begins to show intentional actions. They understand that objects have specific qualities. Cross-modal transfer (information transfer from one sense to another) occurs, and new behaviors emerge that the child imitates by observing others.  

Example: push something away to reach a toy

Tertiary Circular Reactions

From 12-18 months, tertiary circular reactions lead to experimentation. Children are very active and purposeful as they explore through trial and error. They manipulate objects and play with toys in new ways. 

Example: experimenting with different sounds for attention

Early Representational Thought

Early representational thought is the final substage of the sensorimotor period. At 18-24 months of age, a child’s representational thought begins, and they start developing deferred imitation. Instead of imitating the immediate observation, the child retains the memory and repeats the actions they’ve previously observed. 

Example: pretend-play with pots and pans mimicking a parent cooking dinner

Age: Birth to 18-24 years

Goal:  Object permanence


Preoperational Stage: Preschool

The preoperational stage, representing toddlers and young children up to 7 years old, is the second stage of Piaget’s stages of cognitive development. Language development and symbolic thought are key concepts of the preoperational stage. Children use words and actions to represent objects they previously experienced. Preoperational children begin to use symbolic thought when drawing, pretend-playing, and role-playing; the child’s behavior grows as their mental imagery develops. 

Children tend to consider their perspective and point of view as the only viewpoint. Although they can identify an object, they can’t differentiate between individual entities. For example, Piaget’s daughter recognized a slug but thought every slug she saw was the same slug. 

Cognitive development is still intuitive and not based on logical thinking. During the preoperational stage, preschoolers can’t understand complex concepts like comparison, time, or cause-and-effect. Young children see the world from an egocentric point of view and do not understand people have different perspectives.

Age: 2 to 7 years

Goal:  Symbolic thought

Concrete Operational Stage: Gradeschool

 Piaget describes the concrete operational stage of cognitive development as seven years old to eleven years. The key concepts of this stage of development are operational thought and concrete reasoning. 

The child is now in elementary or middle school, becomes more aware of other people and less of themselves. During the concrete operational stage of cognitive development, the child learns that others may not think and feel the same way they do, and their thoughts and feelings aren’t necessarily the reality.

Unlike earlier stages where children struggle with the concept of conservation, concrete operational children begin to understand and use logical operations for inductive reasoning and how they solve problems. The child understands that a tall, thin glass doesn’t necessarily contain more juice than a wide cup. Although developing logical thinking, children are still very literal and concrete in their thinking process during the concrete operational stage. 

Age: 7 to 11 years

Goal:  Operational thought

Formal Operational Stage: Adolescence to Adulthood

The formal operational stage is the final stage of Piaget’s stages of cognitive development and starts in early adolescence to adulthood. During the formal operational adolescence stage, children develop logical thought, systematic planning, and deductive reasoning.

Individual children can formulate hypotheses and test them against reality; use theoretical and abstract concepts for science and algebra, and solve problems using creative logic. Piaget tested children’s physical conceptualization with a simple experiment of balancing scales. He found that only at the age of 13 did children learn logical rules and develop cognitive abilities to form a hypothesis about where to place the weights to balance the scale. Piaget also tested the abstraction of ideas and found older children were more capable of creative solutions during the formal operational stage than younger children in earlier developmental stages. 

Age: 11+ years

Goal:  Abstract Concepts

Concepts of Piaget’s Theory of Cognitive Development

Piaget’s theory had four main concepts that explained what was happening in each of Piaget stages of cognitive development.  


Jean Piaget was the first to introduce schemas into theories of cognitive development. According to Piaget, a schema is a category of knowledge and the process of obtaining that knowledge. Children use schemas to understand and interpret their world.

Biological maturation and interaction with people, nature, and objects result in cognitive development. New experiences and information add and modify existing schemas; schemas must accommodate the new knowledge. Information that doesn’t integrate may cause cognitive dissonance (inconsistency in thoughts, attitudes, and beliefs).  


Assimilation applies an existing schema to a new object, social interaction, or situation. Assimilation tends to be subjective because a person modifies knowledge and experience to fit in with preexisting beliefs or previous knowledge. 


Accommodation is more complex than assimilation and requires changing or modifying the approach when an existing schema doesn’t fit the situation. Children adapt current cognitive structures to accommodate new knowledge; new schemas may also develop. 


Equilibrium is the balance between assimilation (previous knowledge) and accommodation (new knowledge). Equilibrium moves development forward using assimilation to accommodate new information instead of constantly adding new schemas. According to Piaget, growth doesn’t happen steadily but with experiences; equilibration help transform a child from one stage to the next stage.  

Piaget Stages Theory In Education And Parenting

Imagine little adventurous scientists who need to experience, explore, and discover their world in sequential cognitive stages. Experiences children learn through doing help them build various schemas that they can expand on as they grow older. Caregivers, parents, and teachers can present children to the outside world to broaden their experiences of real and hypothetical situations.

Piaget’s theory could help parents decide what type of toys to buy their kids to support their cognitive growth. Introduce new toys when children engage in unstructured play; the toys should relate to the child’s concepts. Problem-solving toys and puzzles will help with cognitive development at later stages. Parents also support more cognitive development by answering their kids’ questions about the world.

The UK government instructed Lady Plowden and her team to review primary education in England; the psychological aspect of the report was based on Piagetian theory. Although Piaget didn’t explicitly relate his ideas to education, his views influenced teaching practices and educational policies; the Plowden report is an example of it. Discovery learning contributed to the significant transformation of the primary school curriculum.

Educators can use Piaget’s theory when deciding which syllabus is appropriate for students in the same grade and age. Curriculum flexibility, use of the environment, play in learning, learning by discovery, and evaluating progress are concepts expressed in the report.

  • The learning process is as necessary as the outcome.
  • Problem-solving skills develop through doing rather than hearing.
  • Children learn when working together on projects or completing individual tasks; they learn from their peers too.
  • Teach a child something when they are ready for it; they can’t learn the next level if they haven’t mastered the previous.

Huitt and Haummel (1998) concluded that slightly more than a third of high school graduates in industrialized countries obtain formal operations. Adolescent and adult learners with limited understanding of abstract ideas and concepts can benefit from specific educational strategies.

  • Educators can use models and visual aids to demonstrate specific concepts. 
  • Educators should teach broad concepts that are relevant to the learner.
  • Allow opportunities for discussing cultural, political, and social issues. 

A study done in Geneva examined the hypothesis that standardized Piaget theory procedures had different results in different societies. Without specific cultural experiences and formal schooling, development may stop at the level of concrete operations and not transition to formal operations. 

 Piaget’s stages help guide clinicians when examining and evaluating patients. A child’s thought pattern before adolescence is more rigid and simplistic. As the child matures, they become more empathetic and less egocentric. For example, a pediatrician won’t be alarmed if a toddler doesn’t understand abstract concepts. However, a clinician may become concerned with a teenager who cannot engage in hypothetical situations.  

The effect of age- and stage-appropriate activities were studied in 56 people with dementia. The study also observed people with Alzheimer’s and how they may regress through Piaget’s stages of cognitive development, displaying each stage’s play interest. However, Piaget’s play descriptions weren’t appropriate for these patients.  

Criticism Of Piaget’s Theory

Despite his magnificent contribution as a developmental psychologist, Piaget’s theory, like most theories, has its shortcomings. Piaget himself noted some, as mentioned earlier in the article. The main criticisms are:

  • Children can perform cognitive tasks at a younger age than their age-appropriate mental developmental stage described by Piaget.
  • Evidence is inconsistent for the four stages of development across different children.
  • Piaget’s stages of development theory do not consider cultural and social influences, which play a significant role in child development.
  • Piaget does not specify which psychological processes drive developmental changes.
  • The experiments for different stages were too complicated for the children.

Many theorists developed new theories in an attempt to address the shortcomings of the four Piaget stages. Neo-Piagetian theories of mental development and Post-Piagetian theories developed in subsequent years.

Despite the challenges to the theory, Piaget made a significant contribution to intellectual development; he made people think about child development and the importance of experiencing childhood. We are no longer in a medieval society where seven-year-old children are seen as miniature adults with expectancies of working, legal consequences, and marriage. The developmental theories of the 20th century, and specifically Jean Piaget’s theory, made people realize children are children with different developmental needs than adults. Caregivers and teachers play an essential role in the mental development of children.

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