Shaping

Begin with the outcome and current response

The terminal response describes the useful outcome in observable terms. The starting response is something the person already does under relevant conditions. Shaping builds a path between them.

Choose a terminal response that matters to the person and permits reasonable variation. An exact posture, voice volume, or movement form may add burden without improving function. Define what must remain stable and what can vary.

Approximations need visible boundaries

Each approximation should be distinguishable from the prior and next step. A progression could involve longer duration, greater distance, more complete movement, clearer communication, closer timing, or another measurable dimension.

Write examples and nonexamples. State which current approximation contacts reinforcement and when the team advances. If two observers cannot reliably identify the step, the definition needs revision before the data guide decisions.

Set advancement and fallback before teaching

For every approximation, write the minimum opportunity count, performance threshold, maximum time at the step, and conditions that trigger clinical review. Add a fallback rule for errors, distress, loss of access, or a change in health or motivation. Avoid creating the next approximation after seeing one convenient response.

Practice scoring with fictional examples near each boundary. Two reviewers should agree about the active step and whether the response meets it. If the next approximation changes two dimensions at once, such as duration and distance, consider smaller steps so the source of difficulty remains visible. Explain the active criterion to the person in an accessible form. Keep earlier successful responses available when they remain functional communication or useful participation.

Record who may approve a step change. Staff and caregivers can report observations, while the qualified clinician interprets the pattern and updates the sequence with the person. Document it.

Reinforcement changes across steps

During shaping, the current approximation receives reinforcement. Earlier forms may contact a different schedule once the next step becomes established. The arrangement should remain understandable and achievable.

The ABAI basic-principles page and BACB Test Content Outline cover shaping, reinforcement, measurement, and evaluation as educational or examination content. They do not provide a universal progression schedule.

Progression can move in either direction

Advance when the predeclared performance rule is met and the person remains comfortable. If responding weakens, errors rise, or distress appears, return to a successful step or redesign the sequence. A rigid upward path can turn attainable practice into repeated failure.

Record every criterion change and date. Avoid pooling results across different approximation definitions. Slow progress may reflect inaccessible materials, a large step, weak outcomes, health changes, or a terminal response the person no longer wants.

Shaping differs from task analysis

Shaping changes the form or dimension of one response across approximations. A task analysis breaks a sequence into component steps. A complex routine may use both, but the team should identify which process applies to each part.

Shaping also differs from accepting any response as “close enough.” The planned approximation and measurement rule determine what counts during that phase.

A fictional music example

Arturo chooses a goal of setting rehearsal volume to a comfortable level with a dial. The starting response is touching the dial. Five steps move toward turning it into Arturo's chosen green range and confirming comfort through speech or AAC.

Across 15 eligible opportunities, Arturo meets the current approximation in 11 of 15, requests a lower step twice, and pauses twice. Report performance within each active step rather than combining different criteria into one success rate. The sample does not show that shaping caused the changes.

Protect communication and assent

ASHA's AAC guidance says AAC users should always have their tools or devices. Approximation criteria should accept the person's effective communication forms and preserve a reliable stop response.

Provide an accessible way to accept, decline, pause, or change practice. Representative consent is distinct from the person's assent. Food, water, bathroom access, mobility, prescribed care, communication, rest, pain support, and emergency help remain available.

Measure benefits and side effects

Track opportunities, active approximation, response dimension, prompts, latency, errors, withdrawal, reinforcement, generalization, maintenance, partner fidelity, burden, and the person's experience. Report whether the terminal response improves daily life.

The current BACB Ethics Code addresses client involvement, consent and assent when applicable, assessment, positive reinforcement, risk, and continual evaluation for covered professionals. Review the goal and method as carefully as the graph.