A speech-language pathologist (SLP) is the primary professional who conducts an AAC (augmentative and alternative communication) assessment. But a thorough evaluation rarely involves just one person. AAC assessments typically bring together a team of specialists, each evaluating a different piece of the puzzle: communication ability, physical access, vision, hearing, and daily needs.
The Speech-Language Pathologist Leads the Process
The SLP is the professional at the center of every AAC assessment. The American Speech-Language-Hearing Association identifies SLPs as playing a “central role in the screening, assessment, diagnosis, and treatment” of people who need AAC. In practical terms, this means the SLP evaluates the person’s current speech, language, and overall communication abilities, then determines which AAC tools or strategies might work best.
During the assessment, the SLP looks at how the person currently communicates (gestures, facial expressions, vocalizations, limited speech), what vocabulary they need, and what communication demands they face across different settings like home, school, work, and medical appointments. The SLP also coordinates the broader evaluation, deciding which other specialists need to be involved and making those referrals.
Not every SLP has deep experience with AAC. ASHA’s Code of Ethics requires SLPs to practice within their competence level. If an SLP lacks adequate training in AAC, they’re expected to refer to, or at minimum consult with, an SLP who has that experience. If you’re seeking an evaluation, it’s reasonable to ask whether the SLP has specific experience with AAC assessments.
Other Specialists on the Team
AAC assessments are described as “transdisciplinary,” meaning professionals from multiple fields contribute their expertise to a single evaluation. Who gets involved depends on the individual’s specific needs, but several specialists commonly participate.
Occupational therapists evaluate motor planning, coordination, and fine motor skills. This matters because using an AAC device often requires tapping a screen, pressing buttons, or pointing to symbols. The OT helps determine which type of physical access works best, whether that’s direct touch, a stylus, or an alternative method. They also address positioning and how the person interacts with objects in their daily environment.
Physical therapists may evaluate seating, posture, and body positioning. How someone sits in a wheelchair or at a desk affects their ability to reach and use an AAC device reliably.
Vision specialists help determine the best ways for a person to see and understand symbols on an AAC system. If someone has a visual impairment, the team needs to know whether symbols should be larger, higher contrast, or arranged differently. The SLP will typically ensure the person wears any prescription eyeglasses during the assessment and request documentation of recent vision evaluations.
Audiologists or hearing specialists confirm that the person can hear the audio output from a speech-generating device. If hearing aids are used, they’re inspected before the assessment to make sure they’re working properly. Environmental modifications like adjusted volume, personal amplification, or changes to the physical space may be recommended based on hearing status.
Rehabilitation engineers and assistive technology (AT) professionals get involved when the physical setup of a device requires customization. This might include mounting systems for wheelchairs, switch access configurations, or eye-tracking hardware.
Special educators contribute when the assessment is for a school-age child. They provide insight into classroom demands, curriculum access, and how the student currently participates in learning.
How It Works in Schools vs. Medical Settings
The setting shapes how the assessment unfolds and who coordinates it. In schools, the SLP typically requests, coordinates, or conducts the AAC evaluation within the student’s natural environment and educational setting. This means observing how the child communicates in the classroom, at lunch, and during other school activities rather than only in a clinical room. Parents and caregivers are included in this process.
In medical or clinical settings, the SLP conducts a comprehensive assessment that looks at communication across all areas of the person’s life, not just one environment. The SLP may evaluate needs for communicating with family, in social contexts, at work, and during medical appointments. Clinical assessments often involve more formal testing of cognitive and communication abilities.
The Role of Physicians and Insurance
Physicians don’t typically conduct the AAC assessment itself, but they play a critical role in getting a device approved and funded. For Medicare coverage of a speech-generating device, the process requires that an SLP formally evaluate the patient’s cognitive and communication abilities before the device is delivered. The SLP then forwards a written evaluation and recommendation to the treating physician, who prescribes the device.
Medicare also has a conflict-of-interest rule: the SLP performing the evaluation cannot be employed by, or have a financial relationship with, the company supplying the device. This is designed to ensure the recommendation is based on the person’s needs rather than a business relationship.
State Medicaid programs have their own requirements. In Massachusetts, for example, an ordering practitioner must prescribe the device and complete medical necessity documentation, including their signature, NPI number, and a description of why the device is needed. The specifics vary by state, but the general pattern is similar: the SLP assesses, a physician prescribes, and both generate documentation for the insurer.
Family and Caregiver Involvement
Family members and caregivers aren’t just observers during an AAC assessment. They’re active participants. ASHA guidelines direct SLPs to involve individuals and family members in decision-making “to the greatest extent possible” throughout both assessment and intervention. Caregivers provide essential information the clinical team can’t observe in a single session: how the person communicates at home, what they try to express most often, what frustrates them, and what motivates them.
After the assessment, the SLP continues working with families through counseling on communication strategies, technical support for the device, and education aimed at preventing device abandonment. A device that sits in a closet helps no one, so the ongoing partnership between the SLP, the person using AAC, and their support network is as important as the initial evaluation.