Table of Contents
The Core Theory and Definition
Lawrence Kohlberg’s stages of moral development represent a significant and influential adaptation of the initial work on moral reasoning conducted by the renowned Swiss psychologist, Jean Piaget. This comprehensive theory posits that ethical behavior is underpinned by six distinct, identifiable developmental stages, where each successive stage provides a more philosophically adequate and complex framework for resolving ethical quandaries than its predecessor. Kohlberg’s crucial insight was that the process of moral maturation is primarily concerned with the concept of justice, and that this development is a lifelong progression, continuing well beyond the childhood years focused upon by Piaget. The theory does not evaluate the morality of a person’s actions themselves, but rather the underlying structure and justification of their moral reasoning, a concept Kohlberg termed “formalism.” This emphasis on the rationale, rather than the conclusion, is fundamental to understanding his six-stage model.
The stages are organized into three overarching levels: the Pre-Conventional, the Conventional, and the Post-Conventional. Following Piaget’s constructivist requirements for a stage model, Kohlberg maintained that these stages are sequential and invariant, meaning individuals cannot skip stages, and it is extremely rare for an individual to regress to an earlier level once a higher one has been attained. Each stage integrates and differentiates the perspectives learned in the previous stages, offering an increasingly comprehensive view of social and ethical norms. This model essentially charts the evolution of an individual’s perspective, moving from a self-centered view based on external consequences to a sophisticated, universal perspective based on abstract ethical principles.
Historical Foundations
Lawrence Kohlberg began developing this groundbreaking theoretical framework during his postgraduate studies in psychology at the University of Chicago. Building directly on Piaget’s earlier claims that both logic and morality develop through constructive stages, Kohlberg expanded the scope of study significantly, following the trajectory of moral judgment into adolescence and adulthood. While Piaget focused heavily on children’s understanding of rules, Kohlberg broadened the inquiry to focus specifically on how individuals rationalize their ethical choices, particularly in complex situations where different moral values conflict.
To facilitate his research, Kohlberg relied heavily on structured interviews that presented participants with moral dilemmas, the most famous of which is the Heinz dilemma. The key objective was not to determine whether the participant decided the protagonist should steal a drug or not, but to analyze the form and structure of their justification. The subsequent classification of these responses into six distinct stages solidified Kohlberg’s position as a leading figure in 20th-century psychology. His work not only produced a measurable developmental scale but also sparked extensive philosophical dialogue regarding the nature of ethics, universalism, and the role of justice in human behavior.
The Three Levels of Moral Reasoning
Kohlberg’s six stages are logically grouped into three levels, each representing a fundamental shift in the source of moral authority and the scope of concern. The transition between levels signifies a profound change in perspective—from an egocentric focus on consequences (Pre-Conventional), to a sociocentric focus on maintaining social order (Conventional), and finally, to a principled focus on abstract, universal values (Post-Conventional). Understanding these three levels is essential, as they map the cognitive growth required for individuals to adopt increasingly complex ethical frameworks.
The framework adheres strictly to the idea that development is unidirectional; an individual must master the perspective of one stage before moving on to the next. The driving force behind this upward progression is the realization that the current stage of moral reasoning proves inadequate when faced with novel or challenging ethical conflicts. This realization compels the individual to seek a more comprehensive and differentiated perspective, thus advancing to the next stage. Kohlberg also acknowledged the possibility of sub-stages, such as Stage 4½, which often occurs during the transition between the Conventional and Post-Conventional levels, marking a period of disillusionment with societal rules before fully adopting abstract principles.
The six stages are categorized as follows:
- Level 1: Pre-Conventional Morality
- Obedience and Punishment Orientation (Avoiding punishment)
- Self-Interest Orientation (What’s in it for me?)
- Level 2: Conventional Morality
- Interpersonal Accord and Conformity (The “good boy/good girl” attitude)
- Authority and Social-Order Maintaining Orientation (Law and order)
- Level 3: Post-Conventional Morality
- Social Contract Orientation
- Universal Ethical Principles (Principled conscience)
Level 1: Pre-Conventional Morality
The Pre-Conventional level of moral reasoning is most frequently observed in young children, although adults may exhibit this reasoning style when their cognitive resources are stressed or undeveloped. Morality at this level is judged exclusively by the direct, external consequences of an action. An individual operating at this level has not yet internalized society’s conventions regarding right and wrong; their focus remains highly egocentric, centered on the self and what external forces impose upon them. This level is characterized by a lack of recognition that others possess viewpoints fundamentally different from one’s own.
Stage one, the Obedience and Punishment Orientation, is defined by a focus on avoiding punishment. Actions are deemed morally wrong simply because they lead to negative consequences for the actor. For example, a child might reason, “I shouldn’t hit my sister because the last time I did, I was grounded.” The magnitude of the punishment often determines the perceived “badness” of the act. There is a strong deference to superior power or prestige, and the individual operates under the assumption that if someone suffers, they must be guilty in proportion to that suffering.
Stage two, the Self-Interest Orientation, shifts the perspective slightly, moving from simple punishment avoidance to maximizing personal gain. Right behavior is defined by whatever best serves the individual’s needs. While a limited interest in the needs of others may emerge, it is purely instrumental; concern for others is not based on loyalty or intrinsic respect but rather a pragmatic, reciprocal arrangement—the “you scratch my back, I’ll scratch yours” mentality. All actions are ultimately intended to serve the individual’s own needs or interests, and the world’s perspective is often seen as morally relative, lacking a unifying societal view.
Level 2: Conventional Morality
The Conventional level of moral reasoning is the typical stage for most adolescents and adults across various cultures. Individuals functioning at this level determine the morality of actions by comparing them against the established views, expectations, and conventions of their society. Conventional morality is marked by an acceptance of societal rules and norms, which are followed even when there are no immediate consequences for obedience or disobedience. The primary motivation is to maintain social order and fulfill one’s designated role within the community.
Stage three, the Interpersonal Accord and Conformity Orientation, represents the individual’s entry into society by striving to fill social roles and earn approval. Individuals seek to be seen as a “good boy” or “good girl,” valuing the positive approval or disapproval they receive from others, as this reflects society’s acceptance of their perceived role. Reasoning at this stage focuses on intent and interpersonal relationships, integrating concepts like respect, gratitude, and adherence to the “golden rule.” The desire to maintain rules and authority exists mainly to support these cherished social roles, and intentions play a more significant role in judging morality; for instance, “They meant well,” can serve as a strong justification.
Stage four, the Authority and Social-Order Maintaining Orientation, elevates the concern beyond individual relationships to the functioning of society as a whole. It becomes crucial to obey laws, dictates, and social conventions because of their importance in maintaining a functioning social structure. Moral reasoning transcends the need for individual approval seen in Stage three, emphasizing that society must transcend individual needs. Laws are viewed as rigid and necessary structures. If one person violates a law, it risks the collapse of the entire system, creating an obligation and duty to uphold the rules. Most active members of society tend to remain at this stage, where morality is dictated predominantly by an external, authoritative force, and culpability is a significant factor in separating right from wrong.
Level 3: Post-Conventional Morality
The Post-Conventional level, often referred to as the principled level, is characterized by a growing realization that the individual is a separate entity from society, and that the individual’s own perspective, grounded in abstract principles, may take precedence over society’s conventions. Individuals at this level live by self-chosen, abstract principles about right and wrong, which typically incorporate fundamental human rights such as life, liberty, and justice. Rules are viewed as useful but changeable mechanisms, ideally designed to maintain general social order and protect inherent human rights, rather than absolute dictates that must be obeyed without question. Contemporary theorists often suggest that many people may never reach this level of abstract moral reasoning.
Stage five, the Social Contract Orientation, views the world as holding diverse opinions, rights, and values, which must be mutually respected. Laws are regarded as social contracts rather than rigid edicts. These laws should be changed when necessary to meet “the greatest good for the greatest number of people,” a goal achieved through majority decision and inevitable compromise. Reasoning at this stage recognizes that while laws are necessary, they are contingent upon consensus and utility. Democratic governance is ostensibly based on Stage five reasoning, prioritizing fairness and procedural justice while acknowledging the relativity of individual opinions.
Stage six, the Universal Ethical Principles Orientation, represents the highest level, where moral reasoning is based on abstract reasoning using universal ethical principles that apply to all humanity. Laws are considered valid only insofar as they are grounded in justice, and a commitment to these universal principles carries an obligation to disobey unjust laws. Decisions are reached categorically, based on principles like the inherent worth of human life, rather than hypothetically or instrumentally. This involves imagining what one would do in another’s shoes, striving for a consensus that results in an action taken because it is fundamentally right, and not because it is expected or legal. Although Kohlberg insisted that Stage six exists, he found it empirically difficult to identify individuals who consistently operated at this profoundly abstract level.
Illustrating Moral Dilemmas
Kohlberg utilized the Moral Judgement Interview (MJI), established in his original 1958 dissertation, to empirically test and categorize moral reasoning. During this semi-structured, tape-recorded interview, participants were presented with fictional short stories known as moral dilemmas, which described situations requiring a difficult moral decision. The participant was then asked a systematic series of open-ended questions about the right course of action and, most importantly, the justifications for their choice. The resulting form and structure of their replies, rather than the content of their decision, were scored to derive an overall stage classification.
The most famous example used in this research is the Heinz dilemma, which presents a scenario where a man must decide whether to steal an expensive, life-saving drug for his dying wife. The dilemma is structured to pit two core moral values—property rights versus the preservation of life—against each other. The diverse justifications offered by participants beautifully illustrate the hierarchical nature of Kohlberg’s stages.
Below is an illustration of how different stages might justify their conclusion regarding whether Heinz should steal the drug:
- Stage 1 (Obedience): Heinz should not steal the drug because he would be put in prison, making him a bad person. The focus is solely on the direct, negative consequence of punishment.
- Stage 2 (Self-Interest): Heinz should steal the drug because he would be much happier if his wife were saved, even if he serves a short prison sentence. Alternatively, he should not steal because prison is awful, and his suffering there would outweigh the benefit of saving his wife. The focus is on maximizing personal outcome.
- Stage 3 (Conformity): Heinz should steal the drug because his wife expects it, and he wants to be a good, loving husband in the eyes of his family and community. The focus is on maintaining positive relational roles.
- Stage 4 (Law-and-Order): Heinz should not steal the drug because the law prohibits stealing, and maintaining a functioning society requires adherence to the rules, regardless of personal circumstance. Alternatively, he should steal but must willingly accept the prescribed punishment to uphold the integrity of the legal system. The focus is on upholding social order.
- Stage 5 (Social Contract): Heinz should steal the drug because everyone has a fundamental right to choose life, and this right supersedes the druggist’s property rights, especially when the law fails to protect the general welfare. The focus is on the utility of laws and human rights.
- Stage 6 (Universal Ethics): Heinz should steal the drug because saving a human life is a universal, non-negotiable ethical principle that is more fundamental than the property rights of another person. The action is taken because it is categorically right, reflecting a principled conscience.
Criticism and Alternative Perspectives
Despite its profound influence, Kohlberg’s theory has faced significant criticism from several perspectives. One major argument is that the theory is overly narrow, emphasizing justice and abstract rights to the exclusion of other moral values, most notably the ethic of care. The most famous critique came from psychologist Carol Gilligan, who argued that Kohlberg’s initial empirical research was developed using only male participants, leading to an “androcentric” bias. Gilligan proposed an alternative theory of moral reasoning centered on the ethics of caring and responsibility, suggesting that women often prioritize relationship maintenance and context over abstract, rule-based justice. While subsequent research has generally not found significant gender differences in the rate or level of moral development, Gilligan’s work successfully broadened the psychological discussion beyond pure justice-centered reasoning.
Furthermore, the theory has been scrutinized for potential cultural bias. Studies applying Kohlberg’s scale across different cultures have shown that while individuals seem to progress through the stages in the same invariant order, they often do so at vastly different rates, and the highest stages (Post-Conventional) appear less frequently in non-Western, communal societies. Kohlberg countered this by asserting that his stages reflect universal underlying modes of moral reasoning, rather than specific culturally inculcated beliefs.
Perhaps the most fundamental challenge comes from social intuitionists, such as Jonathan Haidt, who question the assumption that moral action is primarily a result of formal reasoning. Haidt argues that individuals frequently make moral judgments intuitively and instantaneously, without consciously weighing abstract principles like fairness or human rights. Under this view, the elaborate justifications analyzed by Kohlberg might be considered post hoc rationalizations—arguments constructed after the intuitive decision has already been made—suggesting that moral reasoning may be less relevant to actual moral behavior than Kohlberg’s model suggests.
Lasting Significance and Application
Lawrence Kohlberg’s body of work indelibly shaped the field of psychology, directly leading to the creation of an entirely new area of study focused on moral psychology and development. His eminence is evidenced by his ranking as one of the most frequently cited psychologists in introductory textbooks throughout the 20th century. While his theory is a scale of moral reasoning justification, the general hypothesis holds that higher levels of reasoning correlate with behavior that is more responsible, consistent, and predictable.
The practical application of Kohlberg’s framework is evident in the development of standardized tools for measuring moral judgment. A prime example is the Defining Issues Test (DIT), created by James Rest in 1979 as a quantitative, pencil-and-paper alternative to Kohlberg’s labor-intensive Moral Judgement Interview. The DIT, and its revised version, the DIT-2, heavily incorporate Kohlbergian concepts, particularly the assessment of “post-conventional thinking.” This test continues to be widely used in professional fields such as medicine, politics, and education where the ethical maturity of decision-makers is a critical concern. Kohlberg’s theoretical assumptions also contributed to broader philosophical discussions, aligning his justice-centered morality with plausible formulations of deontology and eudaimonia, reinforcing the idea that morality must be universally valid across societies, thereby rejecting moral relativism.