An ABA single operant reinforcer assessment data sheet follows one defined response across a contingent-consequence condition and a credible comparison for a defined clinical decision. A trustworthy record preserves condition changes, valid observation, actual delivery, session sequence, and the person's experience.

Use this worksheet to plan, record, and review. It cannot choose a single-case design, prescribe baseline, or make a larger response count universal. Those judgments remain qualified, case-specific, and client-informed.

Clinicians & ABA Professionals / Assessment and Treatment Planning.

Participation boundary: Keep communication, AAC, mobility, positioning, sensory supports, breaks, help, ordinary necessities, prescribed care, pain response, rest, safety, relationships, and emergency access available regardless of performance. A comparison condition is not permission to withhold a basic need, remove a needed support, evoke dangerous behavior, or continue after the client withdraws or a stop rule is met.

Define the effect question before choosing phases

A single-operant reinforcer assessment asks whether a specified consequence is associated with a meaningful change in one defined response relative to a credible comparison. Unlike concurrent choice, this design does not rank several consequences. A consequence can support responding when offered alone even if a richer alternative attracts more behavior beside it.

Roscoe, Iwata, and Kahng demonstrated this distinction in a small study. Concurrent schedules showed relative allocation; single schedules detected responding for a lower-preference stimulus overshadowed beside a higher-preference option. The study is not a universal method, but shows why “less selected” and “ineffective” differ.

  • Client priority and decision boundary.
  • Response, measure, candidate consequence, and version.
  • Comparison, intended control, and context.
  • Qualified owner, collaborators, dates, and review trigger.

Write a narrow question such as: “Does the defined switch activation occur at a higher and replicable rate when it produces the selected audio consequence than during the matched no-programmed-consequence comparison?” “Is audio reinforcing?” is too broad to preserve the tested response, schedule, comparison, context, and time.

Build a comparison that addresses the question

A comparison must be safe, acceptable, and responsive to plausible alternative explanations. Depending on the question, it might use no programmed consequence, noncontingent access, a yoked schedule, or another consequence. Each option controls some variables and leaves others open.

Condition featureBaseline or comparisonContingent-consequence conditionSame, intentionally different, or unresolved?Materials, device, visibility, instructions, and opportunity.Effort, motor, communication, and sensory access.Prompts, correction, and partner attention.Consequence presence, schedule, delay, amount, duration, and quality.Ordinary access, session length, and termination rule.

Assessing the potency of high- and low-preference reinforcers provides one research example in which materials for a target response were present during baseline without programmed consequences, followed by FR 1 candidate-consequence conditions. The article's tasks, ten-minute sessions, schedule, stimuli, and instructions are not defaults for this worksheet. Their specificity is the lesson: materials, visibility, prompting, and consequence delivery belong in the protocol.

If a comparison removes the only reason the task is worthwhile, extended exposure may add burden without decision value. Freely available access during baseline may answer a different question. State what the comparison controls and why its duration is minimally adequate.

Preserve acquisition history and response opportunity

A near-zero baseline is interpretable only if the person can perform the response, understands the opportunity, and has the necessary access. Teaching the response during the assessment, changing prompts across phases, or making the response easier in the contingent condition can mimic a consequence effect.

Response-definition fieldEntryIncluded topographies, opportunity, and selected measure.Independent, prompted, corrected, and ambiguous codes.Skill history, effort, positioning, and device reliability.Rapid-repeat, partial-response, invalid-unit, and missing-data rules.

The preference-correspondence study using progressive-ratio schedules separated response acquisition from later baseline and assessment, and used prespecified stopping criteria. It does not mandate that design; it illustrates why acquisition history and stopping rules matter.

Make communication, assent, and withdrawal observable

The person needs a practical way to understand, accept, question, pause, change, or end the arrangement. Record how assent applies when required and how dissent or withdrawal will be honored. The absence of the target response is not automatically dissent, and a high response rate is not automatically assent.

The ASHA AAC Practice Portal states that AAC users should always have access to their communication tools or devices. ASHA Communication Access supports asking about preferences, communicating directly, confirming understanding, allowing processing time, and supporting multiple communication methods.

  • Accessible explanation, consent authority, and assent process when applicable.
  • Reliable yes, no, help, break, change, and stop responses.
  • Communication, motor, sensory, language, and processing access.
  • Feedback, burden, stop actions, and safe response to withdrawal.

Breaux and Smith discuss assent and assent withdrawal in an evolving evidence base. Their article is not a legal standard and does not define every person's signals. Governing consent requirements, the individual's communication, and qualified judgment remain controlling.

Choose a sequence that can support the intended inference

An AB comparison can show a change after the consequence is introduced, but time, practice, maturation, fatigue, and other events may change at the same point. Reversal, withdrawal, multielement, multiple-baseline, changing-criterion, or another arrangement may address different threats, provided its assumptions and burden fit.

Design elementProspective entrySelected design, rationale, and exact condition differences.Phase order and minimum or maximum exposure.Stability, trend, variability, immediacy, overlap, and replication rules.Carryover controls, randomization, counterbalancing, or staggering.Safety, assent, burden, futility, withdrawal, decision rule, and owner.

Withdrawal may be inappropriate when an effect is irreversible, removal would be unsafe or unacceptable, or the client does not agree. Visual strength does not make a design ethical; the answer must justify the exposure.

The unit-price study used an A-B-A arrangement to evaluate response output under baseline and contingent reinforcement, and it examined response cost and benefit parameters. The narrow takeaway here is that response requirement and consequence amount affect response output and should be recorded. The study does not justify academic tasks, edible consequences, FR 1 schedules, or withdrawal for a new client.

Record sessions before summarizing phases

SessionPhase/conditionVersionPlanned minutesValid minutesResponse countRate per valid minuteProgrammed deliveriesObtained deliveriesPrompts or correctionsIntegrity issue or invalid reasonDirect feedback, burden, help, or stop

Retain session order. A phase mean can hide an improving baseline, a declining contingent condition, one outlier, delayed separation, or carryover. Graph the selected dimension against session sequence and mark condition changes, invalid units, changes in access, and withdrawal.

Phase summaryValid sessionsValid minutesResponsesRate per minuteObtained / programmed deliveriesLevel, trend, variability, overlap, immediacy, and burden notesBaseline/comparison 1Contingent condition 1Replication comparisonReplication contingent condition

Fictional accessible-media example

Ravi is a fictional adult working with a qualified clinician on a mastered, low-effort switch activation that may support an optional community-media routine. In the contingent condition, the response produces a brief segment of a client-selected audio story. In baseline, the same response device and materials are present, but no programmed story segment follows the response. Ravi's AAC, breaks, conversation, water, mobility supports, and ordinary leisure access remain available in every phase. Ravi may stop at any time. The example tests arithmetic and review fields only.

The selected demonstration is ABAB with three five-minute sessions per phase. No universal rule requires ABAB, three sessions, five minutes, or the described comparison.

SessionPhaseValid minutesResponsesRate per minute1A1 baseline510.202A1 baseline520.403A1 baseline510.204B1 contingent581.605B1 contingent5102.006B1 contingent591.807A2 baseline520.408A2 baseline510.209A2 baseline520.4010B2 contingent591.8011B2 contingent5112.2012B2 contingent5102.00

A1 totals 1 + 2 + 1 = 4 responses across 15 minutes, or 4 / 15 = 0.27 responses per minute. B1 totals 8 + 10 + 9 = 27 across 15 minutes, or 1.80 per minute. A2 totals 2 + 1 + 2 = 5 across 15 minutes, or 0.33 per minute. B2 totals 9 + 11 + 10 = 30 across 15 minutes, or 2.00 per minute.

Across both baseline phases, Ravi emits 4 + 5 = 9 responses across 30 valid minutes, or 9 / 30 = 0.30 per minute. Across both contingent phases, Ravi emits 27 + 30 = 57 across 30 minutes, or 57 / 30 = 1.90 per minute. The descriptive rate difference is 1.90 - 0.30 = 1.60 responses per minute. The descriptive ratio is 1.90 / 0.30 = 6.33.

The ratio must not stand alone. A ratio with a small denominator can look dramatic, so report the raw counts, minutes, rates, phase sequence, visual features, and integrity beside it. In this fictional display, responding rises with each introduction of the contingent condition and decreases with each return to baseline. A qualified reviewer still examines level, trend, variability, immediacy, overlap, replication, carryover, and other phase changes.

Of 57 eligible contingent responses, 55 produced the programmed story segment. Delivery integrity is 55 / 57 x 100 = 96.5%. The two missed deliveries remain attached to their sessions. Neither the phase mean nor the graph should silently treat a failed delivery as an intact contingency.

This example supports a bounded statement: “For the defined switch response in these twelve sessions, rates were higher in both contingent phases than in both matched baseline phases, with 55 of 57 programmed deliveries obtained.” The pattern cannot prove that the story segment reinforces every response, task, person, schedule, or setting. Nor does it rank the story against alternatives or require its use in treatment.

Audit procedural integrity and unwanted effects

ObservationCorrect conditionMaterials matchedResponse access matchedInstruction correctPrompt rule correctSchedule correctDelay correctAmount/duration correctDelivery verifiedOrdinary access preservedHelp/stop honoredData accurateCorrectOpportunities

The fictional integrity review uses 16 observations across 12 components, creating 16 x 12 = 192 component opportunities. Reviewers record 185 correct and seven mismatches, with 185 + 7 = 192. Descriptive fidelity is 185 / 192 x 100 = 96.4%.

Do not let the aggregate hide a material breach. Missing AAC, an ignored stop, a health event, a changed prompt, an inaccessible device, or a consequence-delivery failure can matter more than the overall percentage suggests. Describe each mismatch and its effect on validity, burden, or safety.

Experience and risk reviewDirect evidenceTiming and conditionAction takenOwner and follow-upClient understanding and current willingness.Help, decline, break, change, or stop.Fatigue, frustration, pain, distress, or sensory load.Unwanted consequence effects.Changes to ordinary access or relationships.Privacy or dignity concern.

For covered behavior analysts, the BACB Ethics Code places obligations around competence, client participation, applicable consent and assent, assessment, risk, records, data, and evaluation. The BCBA Test Content Outline, Sixth Edition names measurement, experimental design, reinforcement, integrity, visual analysis, and data-based decisions as examination content. Neither source selects this design or validates it for a particular person.

Review what else changed with the consequence

Potential confoundEvidence it was controlledEvidence it changedInterpretation or prospective repairTask and response effort.Instructions, prompting, and feedback.Consequence presence, visibility, and partner attention.Schedule, delay, amount, duration, and quality.Recent access, satiation, deprivation, and competing alternatives.Time, setting, noise, people, health, fatigue, and medication.Equipment, software, and delivery reliability.Sequence, carryover, practice, and irreversible learning.

The role-of-context review explains why consequences may appear differently effective depending on whether alternatives are concurrently available. A single-operant result therefore stays bounded to the tested arrangement. It cannot predict how the same consequence will compete with another choice in a natural routine.

The current CASP and APBA assessment-guideline access page describes assessment as individualized and multimodal. It directs users to consider client circumstances, benefit, potential harm, current evidence, competence, and independent professional judgment. The page neither endorses this form nor replaces the judgment it calls for.

Write a qualified effect statement

  • Response, consequence, comparison, schedule, context, and version.
  • Counts, valid time, rates, sequence, and delivery integrity.
  • Visual findings, mismatches, invalid units, and missing evidence.
  • Client feedback, access, burden, help, dissent, and unwanted effects.
  • Supported statement, limits, next action, owner, and review trigger.

Avoid “proved” when the evidence supports a narrower statement. Describe what changed, when it changed, whether it replicated, and what else could account for it. Preserve disagreement and uncertainty. If the result is undifferentiated, that is information about this test, not proof that the person is unmotivated or that no consequence can function as a reinforcer.

An ABA single operant reinforcer assessment data sheet is useful when it lets another qualified reviewer reconstruct the comparison and inspect the session sequence. The final record should make it hard to confuse preference with effect, exposure with contingency, practice with reinforcement, or a conditional result with a permanent label.

Related resources

Sources

The cited studies use small samples, particular responses, and tightly controlled arrangements. They inform measurement and interpretation. They do not establish one best baseline, consequence, schedule, phase length, stop rule, cutoff, design, or predicted outcome.