Piaget’s Theory of Moral Development

Jean Piaget argued that reasoning, not behaviour itself, determines whether an act is right or wrong.

Morality is not a set of learned rules, but a structural shift from rigid obedience toward mutual respect and cooperation. Mutual respect means treating peers as equals.

Piaget found that children’s ideas about rules and punishment change with age, just as their cognitive development does. He avoided the term “stages,” describing instead two overlapping moral orientations that coexist during a transition around age 7–10.

Piaget (1932) suggested two main types of moral thinking:

1. Heteronomous morality: rules as unchangeable and imposed by authorities (moral realism)
2. Autonomous morality: rules are created by people and can be negotiated (moral relativism)

The table below summarises the two orientations side by side:

Feature	Heteronomous morality (5–9 yrs)	Autonomous morality (10+ yrs)
Also called	Moral realism	Moral relativism
View of rules	External, sacred, unchangeable	Products of social agreement, changeable by consent
Respect	Unilateral respect (obedience to adults)	Mutual respect (among peers as equals)
Responsibility	Objective: judged by consequences	Subjective: judged by intentions
Punishment	Expiatory, with immanent justice	Reciprocity and restitution
View of lying	Judged by size of the untruth	Judged by betrayal of trust

Heteronomous Morality (5-9 yrs)

Young children typically exhibit a heteronomous moral orientation, meaning they are subject to another’s laws or rules.

During this phase, morality is heavily influenced by authority figures, and children view rules as external, sacred, and unchangeable laws.

This orientation is characterised by unilateral respect, meaning children show unconditional obedience to parents and other adults.

Children at this level judge responsibility objectively and externally, and their moral beliefs include:

• Expiatory punishment: The belief that one must simply pay the penalty for a misdeed.
• Moral realism: The acceptance of punishment simply because it is handed down by an authority figure.
• Collective punishment: The belief that it is acceptable to punish a whole group (like an entire class) for the misdeed of a single child.
• Immanent justice: The belief that a later mishap or misfortune is an automatic punishment for an earlier misdeed that went unpunished.

Behaviour is judged as “bad” in terms of the observable consequences, regardless of the intentions or reasons for that behaviour.

Therefore, a large amount of accidental damage is viewed as worse than a small amount of deliberate damage.

Autonomous Morality (10+ yrs)

As children mature, their moral compass becomes “subject to one’s own laws or rules”.

They begin to view rules not as unchangeable edicts, but as the products of social agreements, leading to what Piaget called the morality of cooperation.

This shift is accompanied by a transition toward mutual respect within their peer group. Disagreements between equals must now be negotiated and resolved, rather than dictated by an adult.

Older children shift toward an internal responsibility.

They begin to understand that reasoning and intentions underlying a behaviour matter more than the physical outcome. It is this, not the behaviour itself, that ultimately determines whether an action is right or wrong.

They develop an internal sense of responsibility and shift their beliefs toward:

• The principle of reciprocity: Focusing on making good the loss or damage caused by an action.
• Moral relativism: Understanding that justice is not strictly tied to authority.

At this stage, children also abandon their beliefs in collective punishment and immanent justice.

Mechanism of Moral Development

Piaget believed a fundamental reorganisation in moral understanding takes place around age 9-10.

By then, children overcome egocentrism, seeing past their viewpoint. They can now decentre: weighing other people’s intentions and circumstances, and seeing moral rules from someone else’s point of view.

This cognitive shift is necessary for moral development, but it is not sufficient on its own. Operational thought begins around age 7, yet moral autonomy only appears around age 10, a two-year lag that shows cognition alone cannot explain the shift.

Their ideas about rules, responsibility, punishment and justice all shift as a result, moving closer to adult moral thinking.

The reference group for children’s moral beliefs is increasingly focused on other children, and disputes between equals need to be negotiated and compromises made.

Rules

Children now understand that rules do not come from some mystical “divine-like” source. People make rules and people can change them – they are not inscribed on tablets of stone.

With regard to the “rules of the game” older children recognize that rules are needed to prevent quarreling and to ensure fair play.

Indeed, some become quite fascinated with the whole issue. They will discuss the rules of board games (chess, Monopoly, cards) or sport (the off-side rule) with all the interest of a lawyer.

They also recognize that rules can be changed if circumstances dictate, and if everybody agrees. For example: “You’ve got one player less, so we will give you a three goal start.”

Moral Responsibility

With regard to issues of blame and moral responsibility older children don’t just take the consequences into account they also consider motives.

Children begin to realize that behaving in ways that appear wrong is not automatically punished, so long as their intentions were good.

Thus, for them a well-intentioned act that turned out badly is less blameworthy than a malicious act that did no harm.

Lying

Children’s views on lying also change.

The seriousness of a lie is judged in terms of betrayal of trust. They now recognize that all lies are not the same and, for example, you might tell a “white lie” in order to spare someone’s feelings.

They also recognize that saying something untrue is not necessarily a lie.

It could be that they made a mistake or that this is a difference of opinion.

Younger children think lying is wrong because adults punish it. Older children think it is wrong because it betrays trust and undermines friendship and co-operation.

Punishment & Justice

Older children’s beliefs about punishment and justice shift together, away from retribution and toward repair:

• Purpose of punishment: not to make the guilty suffer, but to put things right again.
• Fitting the crime: punishment should help the offender understand the harm caused, such as a vandal repairing the damage.
• Justice is imperfect: real-life justice sometimes lets the guilty escape and the innocent suffer.
• Collective punishment: younger children accept punishing a whole class for one child’s misdeed; older children reject punishing the innocent for the guilty.

Piaget also traced a separate strand: distributive justice. It is the fair sharing of rewards and burdens. Up to about 7-8, children simply defer to adult authority on what is fair.

From about 8 to 11 they insist on strict equality, even against authority. From about 11-12 they weigh individual needs, accepting that fair treatment can mean different treatment for different people.

Peer Interactions

How do peer interactions act as a catalyst for moral development?

Peer interaction serves as the primary mechanism for transitioning children from blind obedience to autonomous moral reasoning.

This shift occurs because peer relationships lack the inherent power imbalance found in adult-child dynamics.

While adults provide safety and structure, they often inadvertently stifle moral negotiation by imposing pre-established rules.

In contrast, peers must actively co-construct their own ethical frameworks through constant social exchange.

From Unilateral to Mutual Respect

Peer relationships drive a shift in whose rules a child follows:

• Unilateral respect: young children follow rules solely because an authority figure issued them, treating morality as external and unchangeable. This leaves them a passive recipient of instruction.
• Mutual respect: children recognise one another as social equals, replacing home and classroom hierarchy. The group must now agree on rules together, marking the start of moral autonomy.

Sociological Conflict and Cooperative Negotiation

Peer interactions inevitably produce sociological conflict, or the clash of differing viewpoints between individuals of similar status.

These disagreements are essential. They force children to defend their own logic while considering the logic of others.

Unlike interactions with parents, peer conflicts cannot be resolved by one party simply “pulling rank.” Children must instead employ practical strategies like bargaining, turn-taking, and compromise.

Successful cooperation requires the mutual coordination of goals. Participants must align their individual desires with the needs of the group.

If a child refuses to negotiate, the play session usually ends in failure. This social pressure creates a functional necessity for fairness.

Through this process, children learn that rules are not divine laws but are flexible tools for social organization.

Overcoming Egocentrism via Perspective-Taking

The friction of social disagreement is the most effective tool for dismantling childhood egocentrism.

This is the cognitive inability to distinguish between one’s own perspective and the perspective of others.

A conflicting idea from a peer creates cognitive dissonance. This is the uncomfortable mental state that comes from holding two contradictory beliefs at once.

To resolve this tension, the child must evaluate the validity of the competing viewpoint.

This evaluation fosters perspective-taking, which is the capacity to mentally represent the internal states of another person.

Children compare their own intentions with those of their peers. This develops a more sophisticated understanding of justice.

They stop focusing purely on the physical consequences of an action. Instead, they begin to weigh the intentions and feelings of the people involved.

Empirical Validation: The Damon and Killen Study (1982)

The hypothesis that peer discussion facilitates faster moral advancement was tested in a landmark laboratory study.

Critical Evaluation

Piaget’s theory of children’s moral development can be seen as an application of his ideas on cognitive development generally. As such his theory here has both the strengths and weaknesses of his overall theory.

Before the limitations below, it is worth setting out the theory’s real strengths:

• Foundational: by attending to children’s reasons rather than their verdicts, Piaget supplied the cognitive-developmental framework Kohlberg (1969) later built his six-stage model on.
• Applied utility: its reciprocity/restitution view of punishment underwrites modern restorative practice in schools, and Damon and Killen’s (1982) study gives the peer-led mechanism direct empirical support.
• Ecological credibility: observing children’s self-made rules in the natural setting of the marble game studied morality where children actually exercise it, free of adult constraint.

1. Reliability

Piaget uses qualitative methods (observation and clinical interviews). His research is based on very small samples. His methods are not standardised and therefore not replicable.

It is impossible to say from his research how generalizable the results are. His is exploratory research, which is useful for generating new ideas rather than for the rigorous testing of hypotheses.

2. Validity

Is Piaget testing what he thinks he is testing? This isn’t clear.

In his story of the broken cups, John accidentally breaks fifteen cups while Henry breaks one while stealing jam. Piaget claims this reveals a difference in children’s views of what is right or fair.

However, it may be that a child’s answer reflects their view of what would actually happen in such circumstances, not what they think should happen.

3. Underestimating children’s rate of development

Piaget placed the shift from moral realism to moral relativism at around age 9 to 10, when younger children are held to ignore motives entirely.

Three independent studies challenge this by unconfounding intention from outcome, which Piaget’s own stories had fused together:

• Nelson (1980): 3-year-olds heard stories where a boy’s motive, good or bad, was shown in pictures as well as words. Even the youngest children weighed the motive when it was made explicit.
• Costanzo et al. (1973): children aged 5-11 heard stories crossing intention with consequence. Reliance on intention rose with age only for negative outcomes, but even the youngest used intention for positive ones.
• Chandler et al. (1973): 7-year-olds judged the same dilemmas told as a verbal story or acted out on videotape. The same children judged by consequence when it was verbal, by intention when videotaped.

All three studies converge: children grasp intention much earlier than Piaget’s ages suggest. His stories made consequences explicit while leaving intentions implicit. It is often the medium or framing of a story, not moral incapacity, that decides whether that intention shows through.

Contemporary Research

The building blocks of moral judgment may appear earlier than Piaget’s ages allow, though how strongly that claim holds depends on the evidence’s quality.

Do Infants Prefer Helpers Over Hinderers?

The best-known single study is Hamlin, Wynn, and Bloom (2007). Infants aged 6-10 months watched a “climber” shape either helped up a hill or pushed down. They then reached for the helper over the hinderer far more often than chance predicted.

That single-study result now sits inside an active replication debate, since several attempts to reproduce the helper preference have failed or found weaker effects.

Do Preschoolers Already Grasp Fairness and Intention?

Preschoolers add a second strand of evidence: Turiel (1983) found 3-4-year-olds already treat harm and fairness as wrong regardless of authority.

The intention-salience studies above show toddlers weighing motive once it is made explicit, too. Weighed together, the evidence suggests moral sensitivity emerges earlier than Piaget proposed, though the meta-analytic caution against overstated infant competence still applies.

4. What do children’s replies to a story actually mean?

This, again, isn’t necessarily clear. Do they understand the story? Are they able to remember it correctly?

Do they give the answer they think will please the experimenter? Or is their reply governed by the substantive aspects of the story rather than the moral principle embedded in it? These interpretive uncertainties weaken any strong inference from a child’s verdict to their underlying moral structure.

5. Does Piaget tell us what we want to know?

Piaget’s research is about children’s moral reasoning. Many psychologists argue that what is far more important is not what children think about moral issues but how they actually behave.

And we should not forget that there is no one-to-one relationship between attitudes and behaviour. LaPiere (1934) demonstrated this in his research with a Chinese couple travelling around America. This leaves much of moral life unexplained.

6. Piaget vs Kohlberg

Kohlberg’s theory focuses on the description of moral thought as a progression through stages leading to the discovery of universal moral principles, particularly justice.

In contrast, Piaget’s constructivist theory emphasizes the individual’s active construction of moral understanding through interactions with the social world.

This difference leads to varying views on universality, autonomy, and the relationship between thought and action.

10. Cultural Variability in Moral Judgement

Many of the age trends Piaget described are supported by later research, including cross-cultural data. Piaget did not assume his Swiss findings would automatically generalise; he held that culture could shape whether certain developmental changes occur at all.

Feature	Piaget	Kohlberg
Nature of Theory	Constructivist: Moral structures are individually constructed through interaction with the social world.	Initially constructivist, but shifts towards a more universalist and rationalist approach.
Universality	Universality is achieved through logical and scientific processes, driven by the true nature of man. This leads to universal forms of moral reasoning, not necessarily specific moral content.	Proposes a universal sequence of moral development leading to universal moral principles, primarily “justice”. This clashes with the idea of individual construction of moral structures.
Moral Autonomy	Autonomy is the independent unfolding of moral concepts constructed through the interplay of action and thought.	Focuses on the description of moral development toward universal principles. Autonomy might be understood as independence from other moral principles or content.
Methodology	Studies the process of moral concept formation through action and thought. Uses methods like the marble game and stories focused on social concepts like “intention” and “equality”.	Utilizes hypothetical stories to create cognitive conflict and study the reasoning behind subjects’ responses. The focus is on moral reasoning rather than action.
Thought-Action Problem	Integrates action and thought as part of the same process, mitigating the thought-action problem.	Criticized for the disconnect between moral reasoning and action. Attempts to address this through concepts like ego strength and types of moral judgment, but the focus remains on following principles rather than knowledge production.
Moral Education	Believes instruction can accelerate development towards moral autonomy.	Early work focused on stage advancement through cognitive conflict. Later work, particularly in “just communities”, emphasizes community moral atmosphere, equality, cooperation, and the role of an instructor/collaborator.
Goal of Moral Education	Development towards “justice” understood as equality and independence.	Stage development of moral thinking towards the discovery of the principle of “justice” as a high, abstract, universal, and rational principle.

Kohlberg’s theory of moral development is often seen as an extension of Piaget’s theory, but they have key differences.

7. Gilligan’s Ethic of Care

Gilligan (1982) disagreed. She challenged the Piaget-to-Kohlberg tradition on grounds of gender bias. She argued that a morality built around abstract rules and justice reflects a male voice.

Women, she said, more often reason from an ethic of care: responsiveness to needs, relationships and context. This critique lands on the whole justice-centred lineage running from Piaget to Kohlberg.

Piaget’s own data hints at why.

The critique has a Piagetian root. Piaget himself judged girls’ games, such as hop-scotch, too simple compared with boys’ marbles to be worth investigating, so his foundational data on rules came largely from boys.

Gilligan did not claim the care perspective was inferior. She argued a justice framework mis-scores it as less mature: different, not deficient. Her perspective foregrounds the empathy and relational concern that a rule-and-consequence account, including Piaget’s, tends to under-weight.

8. Turiel’s Social-Domain Theory

Not every theorist agrees with Piaget here.

Turiel (1983) disagreed. He rejected the idea that young children operate with one undifferentiated heteronomous morality. Even preschoolers, he found, already distinguish the moral domain (harm and fairness, wrong regardless of authority) from the social-conventional (a dress code, changeable by agreement).

The domains stay distinct even at this age.

Even three-year-olds show this. They already treat hitting or stealing as wrong, even if a teacher permits it. They still treat an everyday rule, like a dress code, as something that can be negotiated by agreement.

Turiel also names a third domain: the personal. This covers matters of individual prerogative, such as a hobby or a friendship choice, that a child treats as nobody else’s business. Moral and conventional understanding may develop as parallel, coexisting systems rather than one single stage-like sequence.

A third theorist challenges Piaget from another angle.

9. Haidt’s Social Intuitionism

Haidt (2001) challenges the rationalism shared by Piaget and Kohlberg. On his social-intuitionist model, moral judgements are usually generated by fast, automatic intuitions, such as empathy or disgust. Reasoning then arrives afterwards to justify the verdict.

Haidt calls this the ‘emotional dog’ wagging its ‘rational tail’: intuition leads the way, and reasoning mostly follows just to justify it.

This reverses Piaget’s picture. In it, developing reasoning drives the moral verdict. It fits evidence that people often feel strongly an act is wrong yet struggle to explain why.

Haidt’s model also predicts more cultural variation in moral intuitions than a single universal reasoning ladder would allow. It sits more comfortably than a single-ladder account with evidence of real cross-cultural differences in moral judgement.

Piaget’s Research Methods

To formulate his theory, Piaget used two primary methods:

• Observing Games: Piaget watched children play marbles, a game they govern with their own rules, free of adult influence. He believed morality itself is a system of rules.
• Hypothetical Stories: Piaget told children paired stories about lying, stealing or breaking things, then asked who was naughtier. He cared more about their reasons than their verdicts.

As Piaget (1932) himself put it, explaining why he chose to study marbles:

“Children’s games constitute the most admirable social institutions. The game of marbles… contains an extremely complex system of rules… a code of laws, a jurisprudence of its own… All morality consists in a system of rules.”

Understanding Rules Through the Marble Game

Piaget played marbles with Swiss schoolboys aged roughly 4 to 13, asking them to teach him the rules and to say where the rules came from. He separated two things: how children actually practise a rule in play, and how they think about its status.

The practice of rules develops in phases. Children start with purely individual, motor handling of the marbles, then an egocentric phase of imitating rules while playing alongside others rather than with them. Full cooperation follows, and by about age 11-12 the whole group shares one fixed code.

This distinction turns out to matter.

Children’s consciousness of rules lags behind their practice. A child can follow a rule correctly well before they can explain that it was made up, and could be changed by agreement.

Piaget (1932) was principally interested not in what children do (i.e., in whether they break the rules or not) but in what they think. In other words, he was interested in children’s moral reasoning.

Jean Piaget was interested in three main aspects of children’s understanding of moral issues.

Children’s understanding of rules. This leads to questions like

• Where do rules come from?
• Can rules be changed?
• Who makes rules?

Children’s understanding of moral responsibility. This leads to questions like

• Who is to blame for “bad” things?
• Is it the outcome of behaviour that makes an action “bad”?
• Is there a difference between accidental and deliberate wrongdoing?

Children’s understanding of justice. This leads to questions like

• Should the punishment fit the crime?
• Are the guilty always punished?

Research Findings

Piaget (1932) told the children stories that embodied a moral theme and then asked for their opinion. Here are two examples:

There was once a little girl who was called Marie. She wanted to surprise her mother and cut out a piece of sewing for her. But she didn’t know how to use the scissors properly and cut a big hole in her dress.

Here is a second version.

A little girl called Margaret went and took her mother’s scissors one day when her mother was out. She played with them for a bit. Then, as she didn’t know how to use them properly, she made a little hole in her dress.

The child is then asked, “Who is naughtier?”

Typically younger children (pre-operational and early concrete operational i.e. up to age 9-10) say that Marie is the naughtier child.

Although they recognize the difference between a well-intentioned act that turns out badly and a careless or malicious act, they judge naughtiness differently. They weigh the severity of the consequence, not the motive behind it. This is what Piaget means by moral realism.

Piaget was also interested in what children understand by a lie. Here he found something specific about lying. Younger children measure the seriousness of a lie by the size of the departure from the truth.

Young children judge a lie by its size, not its plausibility. A claimed elephant-sized dog is judged worse than a claimed horse-sized dog, even though the elephant claim is less believable.

Punishment worked the same way.

With regard to punishment, Piaget found something notable. Young children also had a characteristic view of its purpose. Firstly, they saw the function of punishment as make the guilty suffer.

Piaget called this expiatory punishment. It is retributive: an act of retribution or revenge. It reflects a very Old Testament “eye for an eye” view. Punishment acts as a deterrent, and children imagine it more effective the stricter it is.

They also believe in what Piaget called immanent justice. This is the idea that punishment automatically follows bad behaviour.

For example, one story he told was of two children who robbed the local farmer’s orchard.

The farmer saw the children and tried to catch them. One was caught, and the farmer gave him a thrashing. The other, who could run faster, got away.

However, on the way home, this child had to cross the stream on a very slippery log. This child fell off the log and cut his leg badly.

Now when you ask younger children why the boy cut his leg, they don’t say “because the log was slippery.” They say “because he stole from the farmer.”

In other words, young children interpret misfortune as if it were some kind of punishment from God or from some kind of superior force.

For young children, justice is seen as in the nature of things. The guilty in their view are always punished (in the long run) and the natural world is like a policeman.

Piaget (1932) described the morality described above as heteronomous morality. This means a morality that is formed out of being subject to another’s rules.

Of course, for young children, these are the rules that adults impose upon them. It is thus a morality that comes from unilateral respect. That is to say the respect children owe to their parents, teachers and others.

However, as children get older the circumstances of their lives change and their whole attitude to moral questions undergoes a radical change. An example of this is how children respond to a question about the wrongdoing of a member of their peer group.

Young children typically “tell” on others. They believe their primary obligation is to tell the truth to an adult when asked to do so.

Older children typically believe that their first loyalty is to their friends and you don’t “grass” on your mates. This would be one example of the two moralities of the child.

References

Chandler, M. J., Greenspan, S., & Barenboim, C. (1973). Judgments of intentionality in response to videotaped and verbally presented moral dilemmas: The medium is the message. Child Development, 44(2), 315-320. https://doi.org/10.2307/1128053

Costanzo, P. R., Coie, J. D., Grumet, J. F., & Farnill, D. (1973). A reexamination of the effects of intent and consequence on children’s moral judgments. Child Development, 44(1), 154-161. https://doi.org/10.2307/1127693

Damon, W., & Killen, M. (1982). Peer interaction and the process of change in children’s moral reasoning. Merrill-Palmer Quarterly, 28(3), 347-367.

Gilligan, C. (1982). In a different voice: Psychological theory and women’s development. Harvard University Press.

Haidt, J. (2001). The emotional dog and its rational tail: A social intuitionist approach to moral judgment. Psychological Review, 108(4), 814-834.

Hamlin, J. K., Wynn, K., & Bloom, P. (2007). Social evaluation by preverbal infants. Nature, 450(7169), 557-559.

Kavathatzopoulos, I. (1991). Kohlberg and Piaget: Differences and similarities. Journal of Moral Education, 20(1), 47-54.

LaPiere, R. T. (1934). Attitudes vs. actions. Social Forces, 13(2), 230-237.

Lee, K., Cameron, C. A., Xu, F., Fu, G., & Board, J. (1997). Chinese and Canadian children’s evaluations of lying and truth telling: Similarities and differences in the context of pro- and antisocial behaviors. Child Development, 68(5), 924-934.

Margoni, F., & Surian, L. (2018). Infants’ evaluation of prosocial and antisocial agents: A meta-analysis. Developmental Psychology, 54(8), 1445-1455. https://doi.org/10.1037/dev0000538

Nelson, S. A. (1980). Factors influencing young children’s use of motives and outcomes as moral criteria. Child Development, 51(3), 823-829. https://doi.org/10.2307/1129470

Piaget, J. (1932). The moral judgment of the child. London: Kegan, Paul, Trench, Trubner & Co.

Turiel, E. (1983). The development of social knowledge: Morality and convention. Cambridge University Press.