Washing hands, packing a backpack, making a sandwich, logging into a laptop: most useful skills are not single responses but sequences. Chaining is how you teach a learner to link those responses into one smooth performance that ends in a meaningful outcome.
Why it matters
Daily living, vocational, academic, and leisure skills are almost all chains. A well-built program moves a learner from help on every step to independent routines, often what matters most to the person and family. Poorly built programs stall at one step, create prompt dependence, or teach steps that never link.
Task G.12 sits in Behavior-Change Procedures (25 scored questions). Practice items ask you to name the chaining procedure described, choose one for a given learner, and spot why a chain breaks down.
Key ideas
- A chain links responses through stimulus changes. Each response produces a change in the environment. That change works as a conditioned reinforcer for the response that produced it and as a discriminative stimulus for the next response. The last response produces the terminal reinforcer, such as eating the sandwich or going outside.
- Start with a task analysis. Break the skill into small, teachable steps. Watch competent performers, ask experts, or do the task yourself. Then individualize: a step easy for one learner may need splitting for another.
- Assess before you teach. Probe each step so you know where to start and can measure progress.
- Pick a chaining procedure that fits the learner. Forward, backward, and total-task chaining all work, and no method is best for everyone. Base the choice on the learner's existing skills, the length and difficulty of the chain, and practical constraints.
- Plan prompt fading from day one. The goal is for each step to come under the control of the natural stimulus produced by the step before it, not the instructor's prompt.
- Watch the factors that affect chains: how complete and accurate the task analysis is, how long and complex the chain is, the schedule of reinforcement, and variation in materials or required responses across settings.
Definitions
- Behavior chain: a fixed order of separate responses, where each response is set off by its own stimulus and the last one produces the terminal reinforcer.
- Task analysis: breaking a complex skill into its component steps in the order they occur.
- Single-opportunity method: an assessment that stops at the first error or non-response; the remaining steps are scored incorrect.
- Multiple-opportunity method: an assessment in which the assessor completes any step the learner misses and then gives the learner the chance to do the next step, so every step is assessed.
- Forward chaining: teaching the first step to criterion, then the first two steps, and so on through the chain.
- Backward chaining: the instructor completes every step except the last one, which the learner performs and is reinforced for; once mastered, the learner performs the last two steps, and so on, working back toward the first step.
- Total-task chaining: the learner attempts every step in every session, with help on any step not yet mastered, until the whole chain is mastered.
Examples from a session
Chaining across ages and settings
- Clinic, backward chaining: Aiden, 5, is learning to put on his shoes. His RBT does every step except the final velcro press. Aiden presses the strap, hears "You did it!", and heads to the playground. Once that step is reliable, Aiden pulls the strap across and presses it.
- School, forward chaining: Lucia, 12, is learning a 10-step routine for logging into her class tablet. Her teacher reinforces typing her username, the first step, until it is reliable, then requires both the username and the password before reinforcing.
- Vocational program, total-task chaining: Marcus, 28, already folds towels and matches socks but needs help loading the dryer and cleaning the lint trap. His job coach has him do the whole laundry routine every session and prompts only the steps he has not mastered.
- Home, refining the task analysis: Hana, 8, gets stuck squeezing toothpaste. Her BCBA splits that step into "remove cap," "hold brush bristles up," and "squeeze onto brush."
- Non-example (shaping, not chaining): Mr. Daniels, in his day program, is reinforced for holding a cup for 5, then 10, then 20 seconds. One response changes along a duration dimension; no new steps are linked.
How to choose:
- Total-task chaining fits learners who already do many steps or imitate well, or chains that are short and simple.
- Backward chaining guarantees that every trial ends with the learner's own response producing the terminal reinforcer. That is useful when the natural outcome is a strong reinforcer.
- Forward chaining teaches steps in their natural order, is simple for staff to run, and can link smaller chains into a larger one.
Common mistakes / exam traps
- Confusing chaining with shaping. Shaping reinforces successive approximations of one response along a dimension such as volume or duration. Chaining links different responses into a sequence.
- Letting the prompt become a link. If a learner pauses at one step and waits for a prompt, the instructor's prompt, not the natural stimulus from the previous step, controls that response. Fade prompts systematically at that step.
- Skipping the task analysis check. A missing or overly large step often explains a chain that breaks at the same point every time.
Exam trap
Forward vs. backward chaining: ask which step the learner masters first, not who starts the task. If the learner first performs only the last step while the instructor does the rest, it is backward chaining. If the learner attempts every step in every session, it is total-task chaining, not either of the other two.
Exam trap
Single-opportunity assessment is the conservative one: it stops at the first error, so it can underestimate what the learner can do on later steps. Multiple-opportunity assessment shows performance on every step, but the assessor's help can teach steps during the probe.
Quick check
Tariq, 7, is learning to make a bowl of cereal. His RBT completes every step except pouring the milk, which Tariq does before eating. Once Tariq pours milk independently, he is also expected to open the milk carton. Which procedure is the RBT running?
Related topics
- Shaping across dimensions of behavior (G.11)
- Choosing prompting procedures: errorless, most-to-least, and least-to-most (G.7)
- Fading prompts: prompt delay and stimulus fading (G.8)
- Compound schedules: concurrent, multiple, mixed, and chained (B.10)
- Recognizing stimulus control (B.12)
- Establishing conditioned reinforcers and token economies (G.4)