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Kelly's Personal Construct Theory Explained

Psychologist George Kelly proposed that everyone interprets and predicts the world the way an amateur scientist would: by building, testing, and revising a personal set of concepts, or "constructs." This guide covers the theory's main ideas, its eleven corollaries and how it is used.

The fundamental postulate

Kelly's starting point, set out in his two-volume work The Psychology of Personal Constructs (1955), is that a person's psychological processes are channeled by the ways in which they anticipate events. He compared people to scientists, each forming hypotheses about the world and continually testing whether predictions hold up. In this view, personality is not a fixed set of traits but a personal system of constructs used to interpret the world. The theory therefore asks "how does this person make sense of things?" rather than "what is wrong with this person?"

Construction corollary

People notice recurring patterns across repeated events and use those patterns to predict what's likely to happen next. No event repeats exactly, but people extract the common threads running through similar experiences and apply them going forward.

Individuality corollary

People interpret events differently from one another. Even when two people go through the exact same event, they tend to notice different details and assign different meaning to them, which is why individual construct systems can vary so widely.

Organization corollary

People arrange their constructs in a hierarchy, with some constructs ranking above others. A broad construct such as "good versus bad" can contain narrower ones such as "honest versus dishonest." This ordering lets a person move between general principles and specific cases, and it helps explain why changing one high-level belief can change many smaller ones.

Dichotomy corollary

The constructs people use to interpret the world are inherently built from two contrasting poles. A construct like "kind" only carries meaning because its opposite, "unkind," also exists -- every judgment is made within this kind of two-sided contrast.

Choice corollary

When faced with the two poles of a construct, a person chooses whichever seems more likely to help them anticipate and understand what comes next. That choice isn't necessarily the safer or more comfortable option -- it can be whichever one seems likely to expand or sharpen their construct system.

Range corollary

Any given construct only applies usefully to a limited range of events, and falls short outside that range. "Honest-dishonest," for example, is useful for judging a person's behavior but doesn't do much to explain the weather or a broken machine.

Experience corollary

A person's construct system keeps changing as new experiences confirm or contradict their predictions. Repeatedly encountering outcomes that don't match expectations leads someone to revise their existing interpretive framework -- a process Kelly treated as psychological growth itself.

Modulation corollary

How much a person's system can change depends on how permeable the relevant constructs are, meaning how open they are to taking in new events. A person with permeable constructs can adapt to new experiences, while someone whose constructs are rigid may keep applying the same interpretation even when it keeps failing.

Fragmentation corollary

A person may use several subsystems of constructs that do not fit together logically. Someone may be generous at home and ruthless at work without feeling a contradiction. Kelly did not treat this as a flaw. People can hold incompatible views in different areas of life and move between them as needed.

Commonality corollary

To the extent that two people construe their experiences in a similar way, their psychological processes are similar. Kelly emphasized that similarity does not come from having been through the same events, but from interpreting them alike. This is why two people from very different backgrounds can understand each other, and two siblings can live in different worlds.

Sociality corollary

Relating well to someone else requires understanding, at least to some degree, how that person interprets the world. It isn't about sharing the same views -- being able to grasp the framework someone else is using to interpret a situation is what makes smooth social interaction and role-taking possible.

Core and peripheral constructs

Core constructs are those that govern a person's basic sense of identity and are hardest to change, such as "I am a person who cares about family." Peripheral constructs can be altered without a major change to the core. When core constructs are challenged, people tend to resist, because losing them would mean losing a basic frame for making sense of life.

Threat, anxiety and guilt

Kelly defined emotions in terms of construct systems. Anxiety is awareness that the events a person faces lie mostly outside the range of their constructs. Threat is the awareness of an imminent, major change in core constructs. Guilt is the feeling of having moved away from one's own core role, how one sees oneself in relation to others. These definitions are unusual because they describe feelings as signals about the construct system rather than as separate drives.

Repertory grid technique

The repertory grid is an assessment tool Kelly developed to map out the specific constructs a person uses to interpret the world. It typically works by listing several significant people or things, grouping them in sets of three, and asking the person to describe how two are alike and different from the third, building up a detailed picture of that individual's construct system from the answers.

Why constructs always come in opposing pairs

Kelly argued that every construct a person uses is bipolar, built from two contrasting poles rather than existing on its own. Judging something as honest only makes sense because the opposite concept, dishonest, exists as a contrast. This structure is the basic way people discriminate between things and assign meaning to them. It also means that to understand what someone means by a word like "kind," you have to ask what they would call the opposite: for one person the opposite of kind is cruel, for another it is businesslike.

How it differs from other personality theories

Where theories like Freud's or Jung's try to describe universal structures or archetypes said to apply to everyone, Kelly's theory does not offer a single list of constructs meant to apply across the board. Instead, it treats each person as having a potentially different construct system and uses tools like the repertory grid to map that individual's own framework. For this reason the theory sits in an unusual space between cognitive psychology and personality psychology. Trait theories compare people on shared dimensions, while Kelly's approach asks which dimensions a person uses.

A note on scope

This page gives a general overview of a psychological theory for educational purposes. It is not a substitute for professional assessment or treatment, and therapeutic techniques such as fixed-role therapy should be used only with a trained clinician.

Frequently Asked Questions

Once a construct system forms, is it fixed?

No. According to the experience corollary, people keep testing their predictions through new experiences and revise their construct system accordingly. Repeatedly having predictions fail leads someone to change their interpretive framework, a process Kelly treated as learning and psychological growth.

Is the repertory grid technique still used today?

Yes. It is still used in counseling, organizational psychology, education and consumer-perception research as a tool for understanding the specific criteria individuals or groups use to distinguish between people, brands or situations.

How many corollaries are there?

Kelly stated eleven: construction, individuality, organization, dichotomy, choice, range, experience, modulation, fragmentation, commonality and sociality. They follow from the fundamental postulate and describe how construct systems are formed and how they change.

Does the theory say that people are always rational scientists?

No. The scientist is a metaphor to describe how everyone forms and tests expectations, not a claim that people are always logical. People often protect favorite constructs, ignore disconfirming evidence or act out of fear, which Kelly addressed through ideas such as threat and hostility.