Praxis 5331 AAC Guide: Everything You Need for Exam Day

Augmentative and Alternative Communication (AAC) shows up on the Praxis 5331 across multiple content areas — assessment, intervention, and ethics. It's a small percentage of items but a domain where candidates lose points because grad programs cover it unevenly. Here's the AAC knowledge you need for exam day.

What is AAC?

AAC is any communication method that supplements or replaces spoken speech for people with severe communication disorders. It's used across the lifespan — from toddlers with autism to adults post-stroke or with ALS.

Unaided vs. aided AAC

Symbol systems you should know

• PCS (Picture Communication Symbols) — Boardmaker; widely used in schools.
• SymbolStix — used in many SGD apps.
• Bliss symbols — semantic, meaning-based (older system, still tested).
• Photographs — highest iconicity; concrete referents.
• Traditional orthography (text) — for literate users.

Access methods

• Direct selection: touch, point, or use a stylus.
• Scanning: item highlights advance; user activates a switch. Used for severe motor impairment.
• Eye gaze: device tracks pupil to select. Common in ALS, late-stage cerebral palsy.
• Partner-assisted scanning: communication partner points; user signals yes/no.

Vocabulary approaches

• Core vocabulary: The ~200 high-frequency words that make up 80% of what we say (want, more, go, stop, help). Always available on the main page. This is what Praxis questions favor.
• Fringe vocabulary: Topic-specific, less frequent (pizza, teacher, playground). Organized by activity/category.
• Motor planning systems (LAMP): Words stay in the same location to build motor memory.

AAC assessment principles

• Feature-matching: match user's abilities to device features (not the other way around).
• Multimodal: users typically need more than one system (e.g., SGD + gestures + writing).
• Dynamic assessment: try the system, coach, and reassess — not a one-shot test.
• Include the communication partner and environment in the eval.

Common Praxis myths ETS wants you to reject

• Myth: "AAC will slow or prevent speech development."
  Truth: Research consistently shows AAC supports speech development in children who are capable of it. Do not withhold AAC.
• Myth: "The child must demonstrate cognitive prerequisites before AAC."
  Truth: There are no cognitive prerequisites. All communicators deserve access — this is the "least dangerous assumption" principle.
• Myth: "AAC is a last resort after speech therapy fails."
  Truth: AAC is introduced whenever spoken speech isn't meeting communication needs — often alongside speech therapy.

Intervention strategies to remember

• Aided language stimulation: partner models on the device while speaking.
• Expectant delay: pause and wait for the user to initiate.
• Naturalistic teaching: embed AAC use in daily routines.
• Presume competence: assume the user has more understanding than they can express.

Sample Praxis-style scenario

A 5-year-old with cerebral palsy uses head-switch scanning on an SGD. Communication is slow. Which change would most likely increase message rate without changing the access method?

Answer: Move high-frequency core vocabulary to earlier positions in the scan sequence. Auditory scanning cues can also help. Switching to direct selection isn't possible given the motor profile.