To define selection, engagement, refusal, and no response in preference assessment, describe each accessible response form, timing window, partner action, prompt rule, simultaneous response, and invalid-trial condition for the chosen format. Treat refusal and withdrawal as meaningful responses. Treat no response as ambiguous until access and understanding are credible. Keep selection, consumption, engagement, enjoyment, and reinforcement as separate measures and claims.

Define selection by form and window

List reliable speech, AAC, sign, gaze when valid for Zeno, gesture, reach, movement, or other response forms. Specify the opportunity start and response window. Define how a correction or change of mind is honored before access begins.

Define engagement separately

Describe observable contact with or participation in the option, plus onset, offset, simultaneous use, and duration rules. Selection can occur without later engagement, and engagement can reflect availability or effort. Report both when the question requires them.

Define refusal and withdrawal

Include Zeno's no, stop, away movement, device message, return of an item, or other individualized response. State that partners end or adapt the trial as required. Refusal never becomes a prompt opportunity to force a choice.

Preserve no response

Use no response only when the full window passes without a defined selection or refusal and all access gates remain valid. Record possible uncertainty. Do not infer dislike, inability, inattention, or consent from the category alone.

Predeclare prompt and invalidity rules

Specify any orientation or neutral instruction, which prompts change independence status, and when equipment, representation, partner, timing, availability, or procedural errors invalidate a trial. Keep invalid trials in the planned denominator.

Calibrate observers

Train observers on the same selection, refusal, engagement, no-response, and invalid examples. Sample agreement across relevant forms and conditions. Agreement cannot repair a definition that excludes Zeno's communication or combines unlike events.

Protect Zeno's choice and basic access

For Zeno, preserve AAC and other effective communication, privacy, ordinary supports, adequate food and water, bathroom, mobility, prescribed care, pain response, rest, supportive relationships, and emergency help. Verify health and safety before presenting options. Use applicable consent and assent processes, honor refusal and withdrawal during nonemergency participation, and never classify an access failure as low preference.

Build Zeno's evidence ladder

Begin with Zeno's accessible direct report and ordinary voluntary choice. Add source-labeled caregiver or staff suggestions, natural engagement, structured preference sampling, or response-consequence testing only when the decision needs stronger evidence. Keep preference, familiarity, availability, selection, engagement, reinforcer function, treatment choice, and outcome distinct. State what each layer can and cannot show.

Explain the assessment to Zeno

Use Zeno's preferred language and communication mode to explain the purpose, option set, method, duration, access, presentation, any removal, response definitions, privacy, risks, stop route, possible decisions, and uncertainty. Invite nomination, rejection, correction, pause, and withdrawal. Meaningful choice includes the ability to choose none, change a choice, or value an activity outside treatment.

Build Zeno's preference-response coding guide

Create one versioned preference-response coding guide for the single-stimulus activity assessment. Include purpose, client priority, option source, setting, method, definitions, access, health, consent and assent when applicable, ordinary supports, exposure, position, prompts, refusal, no response, invalidity, stops, integrity, raw data, client report, uncertainty, qualified authority, decision, safeguards, revision, and recheck trigger.

Work through Zeno's example

Zeno completes 20 planned single-stimulus trials. Eighteen meet the access and procedure rules: eight contain a defined selection, four a defined refusal, and six no response within the window. Two are invalid after an access switch failure. Report 8/18 selection, 4/18 refusal, 6/18 no response, and 2/20 invalid trials. Never recode refusal or invalid access as nonselection. Preserve planned and valid units, raw counts, denominators, source labels, access states, missing conditions, refusals, stops, corrections, versions, decisions, and open work. This fictional example demonstrates one assessment control. It supplies no universal rank, preferred-item label, reinforcer function, legal conclusion, treatment effect, or outcome guarantee.

Use Zeno's evidence for a bounded decision

Identify the exact decision and qualified owner before expanding assessment. For Zeno, document supporting and conflicting evidence, client preference, option and method limits, access, health, alternatives, burden, further evidence, selected action, implementation check, accessible explanation, disagreement route, and review trigger. Choose the least burdensome adequate path and stop collection that cannot change action.

Review Zeno's data without causal shortcuts

For Zeno, show raw selections or engagement and denominators, representative exposure, direct and proxy sources, access, health context, recent availability, refusals, invalid trials, position, method integrity, missingness, alternatives, and uncertainty. Relative preference supports a candidate under sampled conditions. A reinforcement claim requires a response-consequence relation and evidence suited to that claim.

Address Zeno's main assessment risk

If staff count only reaches, Zeno's AAC selection disappears. If every no response becomes rejection, uncertainty is lost. If consumption is labeled enjoyment, the record claims an internal state it did not measure. Review definitions, client meaning, option source, access, health, method fit, exposure, position, removal, integrity, comparison, causal scope, and authority separately. A familiar format cannot rescue inaccessible options or justify unnecessary burden. Technical ranking never overrides Zeno's current communication or basic access.

Choose Zeno's next assessment action

Zeno reviews the coding examples through AAC, corrects one refusal example, and asks staff to extend the response window before the next assessment block. Record qualified owners, current safeguards, method and option versions, evidence tasks, due dates, validation, client communication, uncertainty, decision, and next review. Preserve the original data when the account changes. A later result adds an auditable version instead of rewriting what Zeno selected under earlier conditions.

Apply current preference-assessment sources to Zeno's method

For Zeno, the CASP public summary gives high-level context for ABA treatment of autistic people. The current BACB Ethics Code addresses competence, client involvement, understandable communication, consent and assent when applicable, assessment, intervention, risk, documentation, and evaluation for covered people. BACB has no separate organizational jurisdiction. The BCBA outline includes preference-assessment design and evaluation as examination content, not a client protocol or practice authority.

Use preference-method research carefully for Zeno

For Zeno, Lill, Shriver, and Allen synthesized 65 articles into SPADS to help trained practitioners choose context-specific stimulus-preference assessment procedures. It identifies candidate reinforcers rather than proving a consequence's functional effect. A seven-participant DeLeon and Iwata study compared paired-stimulus, multiple-stimulus-with-replacement, and MSWO formats and described its results as preliminary. A two-child Kang study found removal-related problem behavior in paired and MSWO sessions under its tested conditions. These studies guide questions and safeguards; they do not create a universal method or threshold.

Protect assent and communication access for Zeno

Breaux and Smith offer assent-focused practice guidance in an evolving evidence base. ASHA states that AAC users should always have access to their communication tools or devices. For Zeno, preserve an accessible way to nominate, select, reject, pause, stop, correct, and change a choice. Do not require speech, eye contact, one motor form, compliance, or loss of essential access as the price of participation.

Close Zeno's preference review

Review the preference-response coding guide with Zeno, the responsible clinician, access and operational owners, and the specialists named in the manifest. Verify that options remain accessible and optional, basic access is protected, methods fit the question, refusals and invalid trials remain visible, preference and reinforcement claims stay separate, and decisions remain within authority. Keep this page draft and noindex until every required review is complete.

Related resources

Sources