Small Steps, Big Changes: How to Shape Behavior, Explained

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Small Steps, Big Changes: How to Shape Behavior

Educational Psychology · Chapter 3: Behavior, Conditioning, and Classroom ManagementSection 3.7 · lesson 25 of 1008 min · free with a free account

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In this lesson

Successive approximations, chaining, and knowing when you moved too fast.

  • Define shaping and successive approximations
  • Choose between forward and backward chaining
  • Design a token economy and a behavior contract
  • Apply the eighty percent rule to calibrate step size

Transcript

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Behavior, Conditioning, and Classroom Management

Small Steps, Big Changes: How to Shape Behavior

A student who has never done a thing cannot be rewarded for doing it. That sounds obvious, and it defeats most reward systems. You cannot reinforce a behavior that never occurs. This section is about the solution, which is called shaping. We will define successive approximations and what makes a good one. We will look at chaining, forward and backward. Then at token economies and behavior contracts. And we will finish with a specific diagnostic. The eighty percent rule, which tells you when you moved too fast. The theme throughout is calibration rather than patience alone.

Definition

Reinforcing What Is Nearly Right

Behavior shaping is the systematic reinforcement of successive approximations. Approximations of a target behavior, moving progressively closer to it. Here is the core move. Do not wait for the final, complete behavior to appear before reinforcing. Instead, identify intermediate steps toward the goal. Each time the student's behavior comes closer, reinforcement is provided. Then, as the student masters each approximation, the criterion rises. It rises slightly, requiring a closer match to the target. That word slightly is where all the skill lives. Raise it too much and the student fails. Raise it too little and you are reinforcing a plateau.

When To Use It

Behaviors That Cannot Be Rewarded Directly

When is shaping the right tool? Three conditions, and any one of them is enough. The target behavior is complex. It has never been performed before. Or it is too far from the student's current repertoire to reward directly. Underneath those conditions is a claim about behavior itself. Complex behaviors are not all-or-nothing achievements. They are built up from simpler component behaviors over time. That should sound familiar from cognitive theory. Shaping is the behavioral equivalent of scaffolding, in Vygotsky's sense. Support the learner at their current level. Then systematically fade that support as competence grows.

Approximations

Three Requirements for Every Step

Successive approximations are the intermediate steps. And each one must satisfy three requirements. First, it must be measurably closer to the target than the last. Measurably, not vaguely. Second, it must be achievable given the student's current skill level. Third, it must be clearly distinguishable from the previous step. That third one is often overlooked, and it is practical. If two steps blur together, you cannot make consistent decisions. You will reinforce inconsistently without noticing. So the art of shaping is selecting the right size of step. Neither too large, which causes the student to fail. Nor too small, which makes progress unnecessarily slow.

Chaining

When the Target Is a Sequence

Chaining is a related technique for a different shape of problem. Use it when the target behavior is a sequence of discrete steps. There are two directions. Forward chaining teaches and reinforces the first step. Then it gradually adds the subsequent steps, in order. Backward chaining reverses that. The teacher completes all but the last step. The student completes only the final response. Then you work backward, adding earlier steps over time. Backward chaining has one real advantage. The student always finishes the task, which means they always reach the payoff. Both approaches are used extensively in special education. And for academic procedures like multi-step mathematics problems.

Key Idea

A Bridge, Not a Lowered Bar

Here is the key idea, and it needs defending. Behavior shaping is not about accepting less than the target. It is about providing a behavioral bridge to reach it. Every approximation reinforced is a step closer to the goal. That distinction matters more than it might seem. Shaping looks like lowered standards to an observer arriving mid-process. You are praising something that is clearly not good enough. But the standard has not moved. Only the current criterion has, and it is scheduled to rise. The teacher's skill lies in calibrating the size of each step. Calibrating it to the student's current ability, which changes weekly.

Token Economies

Conditioned Reinforcers, Exchanged Later

A token economy is a systematic application of operant conditioning. Students earn tokens for target behaviors. Points, stickers, chips, or virtual badges. Those tokens are conditioned reinforcers. They have no value in themselves, which is the whole design. Tokens are exchanged later for backup reinforcers. Preferred activities, tangible items, or privileges. Token economies suit classrooms with diverse behavioral needs. The reason is that they allow individualization inside one shared system. Each student can work toward a different backup reinforcer. And different behaviors can be targeted for different students. One visible system, many private contracts.

Behavior Contracts

Making the Contingency Transparent

Behavior contracts make the contingency explicit and shared. A contract is a written agreement between a teacher and a student. It specifies four things. The target behavior. The criterion for success. The reinforcer to be earned. And the timeframe. Contracts promote student agency in a specific way. They make the contingency transparent. And they involve the student in setting the goal. Research tells us when contracts are most effective. When students participate in designing them. When goals are specific and attainable. And when the reinforcers are meaningful to that individual student.

Compared

Four Techniques and Their Conditions

Five techniques, and each fits a different condition. Use behavior shaping when the target behavior is absent or very rare. Building handwriting from scribbles to legible letters is the classic case. Use forward chaining when the task has a natural beginning. Teaching students to write a structured paragraph, for example. Use backward chaining when the task has a meaningful end product. The student finishes the last step of a multi-step equation. Use a token economy when you need flexible, individual reinforcement. A sticker chart with a choice of backup activities. And use a behavior contract when a student needs ownership and clarity. A contract for daily homework completion. Matching the technique to the condition is most of the decision.

In Practice

Five Steps to Speaking in Class

Here is shaping in a real and difficult case. A teacher wants a selectively mute student to participate verbally in class. She does not ask for that behavior, because it will not happen. She builds toward it, in five steps. First, she reinforces written responses. Second, whispering to a partner. Third, speaking quietly in a small group. Fourth, answering a yes-or-no question aloud. Fifth, volunteering a complete answer. Each step is celebrated before the next one is introduced. Within eight weeks, the student participates in whole-class discussions. No single step in that sequence was dramatic. And critically, none of them was skipped.

The 80% Rule

How to Know You Moved Too Fast

There is a specific diagnostic for shaping too fast. It is sometimes called the eighty percent rule. Watch the student's success rate at the current approximation. If it drops below roughly eighty percent, you moved the criterion too far. Too far, too fast, and the fix is not encouragement. Return to the previous approximation. Rebuild mastery at that level until it is solid. Then try the next step again, and make it smaller. Patience and precision are the hallmarks of effective shaping. And there is a real cost to getting this wrong. A failed step does not merely waste time. It teaches the student that trying harder did not work. Which is precisely the lesson shaping exists to prevent.

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Educational Psychology carries a NCCRS credit recommendation. These universities work with NCCRS; some are UPI Study's signed partners. ACE and NCCRS have over 2,100 cooperating colleges that will consider accepting credits; the final decision is with the universities.

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FAQ

Questions students ask us

About Small Steps, Big Changes: How to Shape Behavior

What is behavior shaping in educational psychology?
Behavior shaping is the systematic reinforcement of successive approximations, meaning steps that move progressively closer to a target behavior. Instead of waiting for the complete behavior to appear, a teacher reinforces each intermediate step and then raises the criterion slightly once the student masters it. Shaping fits behaviors that are complex, have not been performed before, or are too far from the student's current repertoire to reward directly.
What is the difference between forward chaining and backward chaining?
Forward chaining teaches and reinforces the first step of a sequence and then adds later steps in order, while backward chaining starts from the end. In backward chaining the teacher completes every step except the last, the student performs the final response, and earlier steps are added over time. Its advantage is that the student finishes the task each time and reaches the payoff, as when completing the last step of a multi-step equation.
How does a token economy work in a classroom?
A token economy is an application of operant conditioning in which students earn tokens, such as points, stickers, chips or virtual badges, for target behaviors and later exchange them for backup reinforcers like preferred activities, items or privileges. The tokens are conditioned reinforcers with no value of their own. The system suits classrooms with diverse needs because each student can target different behaviors and work toward a different reward.
What is the eighty percent rule in behavior shaping?
The eighty percent rule is a check for shaping too fast: if a student's success rate at the current step drops below roughly eighty percent, the criterion was raised too far. The fix is to return to the previous approximation, rebuild mastery there, and then try a smaller next step. Pushing ahead with encouragement alone risks teaching the student that trying harder does not work.

About the Educational Psychology course

How many college credits is Educational Psychology?
Educational Psychology (Psychology 120) carries a NCCRS credit recommendation for 3 semester credits. ACE and NCCRS have over 2,100 cooperating colleges that will consider accepting credits; the final decision is with the universities.
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