ABA graph phase changes belong at the first observation under the changed condition, with a concise label for what actually changed. Preserve the planned date, training date, authorization date, and delivered date separately. If implementation overlaps or remains uncertain, show a transition state. A phase line should make the record clearer rather than imply a clean change that never occurred.

Use delivery evidence

Anchor the line to treatment-integrity records, session documentation, system versions, and the responsible clinician's confirmation.

Name the changed components

Label prompt, reinforcement, schedule, setting, staff qualification, measurement, or other material changes.

Show transition periods

Use a shaded or separately labeled period when components roll out gradually or differ by staff.

Keep authority separate

A graph label records a condition; qualified roles still make clinical and operational decisions.

Reconcile approval, training, and delivery

Create a phase-change record with the proposed date, clinical decision date, consent or authorization state when applicable, staff-training date, system-release date, and first confirmed delivery. These events often differ. The graph line belongs at the first data point collected under the delivered condition, while earlier milestones can appear in a note or annotation.

Use treatment-integrity evidence to confirm delivery. A signed plan or completed training does not show that the changed component reached the session. When documentation conflicts, hold the phase boundary as unresolved and route it to the responsible clinician.

Handle gradual or mixed implementation

A single vertical line works when the material components change together. Use a transition band when staff adopt the procedure across several sessions, when one setting changes before another, or when access supports arrive later. Label which components were active during each observation.

If the measurement definition changes at the same time as treatment, preserve that as a separate annotation. An apparent level shift may reflect a new recording rule. Consider separate series or a clear comparability warning when the old and new measures answer different questions.

Reconcile Mateo's phase boundary

Mateo's revised prompt procedure first appears in session ten. Sessions eight and nine occur after approval but before confirmed delivery, so they remain in the prior phase. The phase line belongs between sessions nine and ten. The approval date can be shown with a symbol or note that does not reclassify those observations.

If integrity data for session ten were missing, the first confirmed session would determine the display boundary and the uncertain sessions would need a transition state. Preserve the uncertainty instead of choosing the cleaner-looking line.

Review ABA graph phase changes before release

The phase-change reconciliation for Mateo identifies the clinical question, source record, unit, denominator, time basis, display rule, qualified decision owner, and next review before construction. Preserve the raw data and the exact graph version shown to reviewers.

Work the graph example for Mateo

Mateo's plan approves a prompt change before session eight. Records show the revised procedure first occurs in session ten. The graph places the phase line between sessions nine and ten and annotates the earlier approval. Sessions eight and nine remain in the prior delivered condition.

Audit what the display leaves out for Mateo

For Mateo, record missing observations, invalid points, small or zero denominators, phase uncertainty, context changes, access conditions, and any series hidden by aggregation. A clean picture gains value only when those states remain available for review.

Protect access and client meaning for Mateo

During Mateo's accurate phase labels review, keep AAC, interpreters, mobility, food, water, bathroom use, prescribed care, health supports, rest, relationships, and emergency help available. Ask the person through accessible communication whether the outcome and display reflect something useful. Immediate safety action never waits for graph completion.

Use sources within their role for Mateo

For Mateo, the BACB ethics hub and CASP public summary provide professional context. The BCBA Test Content Outline includes graphing, visual analysis, and data-based decisions as examination content. The WWC handbook page and Version 5.0 handbook address research review, so routine care should avoid borrowing a causal claim without suitable design.

For the accurate phase labels question, Lobo and colleagues discuss single-case design and analysis, while Wolfe, Barton, and Meadan describe systematic visual-analysis protocols. McTiernan and colleagues show that linear and ratio scales can produce different visual impressions. Zonneveld and colleagues study graph-construction training. ASHA supports continuous access to AAC tools.

Close the graph review for Mateo

Review the phase-change reconciliation with Mateo and the responsible clinician. Record the display choice, source lineage, graph version, interpretation limits, decision, owner, next data requirement, and review date. Reopen the audit when the definition, measure, axis, condition, criterion, context, access, or software changes.

Before release, verify the boundary against source evidence, label every changed component, and preserve transition or uncertainty states. Confirm that approval, training, authorization, and delivery dates remain distinct and that the graph text avoids attributing change to the phase without a suitable design.

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