From bilingual AI tools to updated screening practice, here's what emerging research means for SLPs and families.
About 7 percent of U.S. children have developmental language disorder, yet only 8.6 percent of ASHA-certified speech-language pathologists are multilingual service providers. That gap sits at the center of new research out of Texas Christian University, where clinician-researchers are testing an AI-assisted bilingual vocabulary program for Spanish-English learners, a project that reframes a familiar clinical problem as a workforce problem too.
For students weighing a specialization and clinicians managing dual-language caseloads, the tension is concrete: demand for bilingual service delivery is outpacing the supply of clinicians trained to provide it, and technology is being tested as a bridge rather than a replacement.
Researchers are addressing that gap through assessment protocols, evidence-based intervention models, and bilingual research that is reshaping SLP Grad School Curriculum and school-based practice.
Roughly 7 percent of children in the United States have developmental language disorder, or DLD. In practical classroom terms, that translates to about two children in every average class of 28 students1, a figure that has held steady across multiple studies and is cited by both the National Institute on Deafness and Other Communication Disorders and the American Speech-Language-Hearing Association. Despite its prevalence, DLD remains far less recognized than autism spectrum disorder or dyslexia, both of which affect smaller shares of the pediatric population.
DLD is a neurodevelopmental condition that impairs a child's ability to learn, understand, or produce spoken and written language. Crucially, it is not caused by hearing loss, neurological damage, or intellectual disability. Under current international classification standards (ICD-11), DLD is its own diagnostic entity. In the United States, clinicians typically map DLD to the DSM-5-TR category "Language Disorder" (F80.2), which aligns closely with international criteria even though the DSM does not use the DLD label explicitly.2
DLD sits inside a larger family of speech-language disorders that speech-language pathologists encounter daily:
Understanding where DLD fits helps clinicians choose the right assessment tools and avoid misdiagnosis.
Autism spectrum disorder requires both persistent social communication deficits and restricted or repetitive behavior patterns. DLD, by contrast, centers on language learning difficulties without the behavioral component. The two conditions can co-occur, which is precisely why differential diagnosis matters: a child with DLD alone needs a different intervention plan than a child who also meets autism criteria. SLPs are expected to rule out autism before diagnosing social (pragmatic) communication disorder, which is mutually exclusive with an autism diagnosis under current guidelines.
Accurate diagnosis is not just a clinical nicety. It determines whether a child qualifies for school-based services under IDEA, what funding streams are available, and which evidence-based interventions are appropriate. As research refines how DLD is identified and distinguished from overlapping conditions, SLPs who stay current with classification updates are better positioned to advocate for the children on their caseloads and to secure the resources those children need.
Developmental language disorder is more common than autism spectrum disorders and dyslexia, yet it remains one of the least recognized conditions in classrooms across the country. For SLPs and educators, the prevalence translates directly into everyday caseloads.
A complete picture of a child's communication abilities rarely comes from a single test score, so SLPs must weigh formal standardized data against how a child actually uses language in daily life.
Case history grounds the assessment in context. SLPs gather birth, hearing, medical, developmental, and family language history. A detailed birth and developmental timeline matters because DLD is not due to hearing loss or other acquired conditions. Family concerns often emerge before formal testing catches the gap. Parent and teacher reports are not add-ons; they flag functional concerns that norm-referenced tools can miss, such as a child who tests within broad normal limits but falls apart during classroom instructions or peer play. Direct observation in natural settings, whether a classroom, playground, or clinic waiting room, adds another layer.
Standardized, norm-referenced tests compare a child to same-age peers, but they are only one piece of slp evaluation and treatment planning. Receptive and expressive language subtests can identify patterns, but they should never be used alone, especially with children from culturally and linguistically diverse backgrounds. Language sampling captures spontaneous grammar, narrative structure, and conversational turns. Clinicians listen for grammatical morphemes, sentence complexity, and story cohesion in spontaneous speech rather than relying only on elicited responses. Dynamic assessment measures how a child responds to brief teaching, which helps separate language difference vs disorder, especially for bilingual learners. For bilingual children, testing in both languages and observing how quickly a child learns new language structures during teaching can reduce misdiagnosis. Differential diagnosis is key: developmental language disorder is a neurodevelopmental condition not caused by hearing loss, neurological damage, or intellectual disability. SLPs rule out hearing concerns and consider autism spectrum disorder, intellectual disability, and other conditions before settling on DLD.
In schools, assessment often focuses on educational impact and eligibility under federal special education law, so SLP reports tend to link language deficits to classroom participation and academic progress. Hospital settings may use bedside or clinic-based protocols with input from audiologists and developmental pediatricians; private clinics often allow more extended, repeated sampling. Early intervention programs rely heavily on play-based, routines-based observation and parent interview because toddlers are rarely test-ready. Across all settings, the strongest profiles combine formal testing with parent and teacher report, language sampling, and observation. No single measure captures a child's full profile, so the goal is convergence across sources. That mix reduces the risk of over- or under-identifying a child and leads to intervention targets that matter outside the testing room.
Speech-language pathologists working with pediatric caseloads have a growing toolkit of evidence-based interventions, each supported by research across different communication disorder types. The table below summarizes key approaches, the populations they target, and what recent studies reveal about their effectiveness. Note that many of these models share a common thread: empowering parents and caregivers as active agents in therapy, a strategy that research consistently links to stronger language outcomes.
| Intervention Model | Target Disorder or Population | Key Evidence and Findings |
|---|---|---|
| Parent-Implemented Language Interventions (e.g., Parents Plus) | Preschool children with developmental language disorder (DLD) | The Parents Plus program showed improvements in children's vocabulary and morphosyntactic skills in a randomized controlled trial of 31 parent and child dyads. A broader meta-analysis of 25 RCTs found that parent-implemented shared book reading (effect size g = 0.37) and play or routine-based activities (g = 0.50) produced significant moderate effects on expressive vocabulary. |
| Caregiver-Implemented Communication Intervention | Toddlers at risk for persistent language delays | A randomized controlled trial (Working on Rapid Language Development project) tested a caregiver-delivered communication intervention for at-risk toddlers. A separate pilot RCT of 59 children found promising evidence that systematic parent-implemented language intervention within home visiting programs enhanced young children's language development. |
| Early Interventions for Late Talkers | Children identified as late talkers before 36 months of age | A meta-analysis of early interventions for late talkers reported significant aggregated effects: g = 0.48 for expressive vocabulary, g = 0.83 for syntax, and g = 0.40 for overall language outcomes. |
| Enhanced Milieu Teaching (EMT) and Aided EMT | Children with autism spectrum disorder; toddlers with cleft palate and language delay | Combining aided AAC with enhanced milieu teaching produced statistically significant increases in symbolic communication for two of three autistic children (phi 0.70 to 0.81, p < .001), with generalization to a novel communication partner. An EMT plus Parent Education (EMT+PE) protocol is also being tested via telepractice for toddlers with nonsyndromic cleft palate. |
| Naturalistic Developmental Behavioral Interventions (NDBIs) | Young children with autism spectrum disorder | A review of six representative NDBI approaches (including JASPER, EMT, SCERTS, PRT, ESDM, and parent-implemented social coaching) positions EMT as a core naturalistic strategy for improving social communication in early autism intervention. |
| Hanen More Than Words (Online Parent Training) | Parents of autistic children | A randomized controlled trial of 22 Chinese families found that the intervention group showed significant improvements in parent and child attention synchrony and larger effect sizes on children's spontaneous communication compared with controls. |
| Parent-Mediated Play-Based Interventions | Preschool autistic children | A systematic review and meta-analysis protocol is examining parent-mediated play-based interventions designed to improve social communication and language skills. This growing evidence base supports structured parent coaching as a service delivery model. |
| PROMPT Motor Speech Treatment | Children with speech production difficulties and speech sound disorders | A literature analysis covering PROMPT studies from 1984 to 2020 found that PROMPT is effectively used internationally as a tactile-kinesthetic motor speech therapy method providing direct support to spoken output. |
| LSVT LOUD for Pediatric Dysarthria | Children with spastic cerebral palsy and dysarthria | In an intensive voice treatment study, parents reported improved perception of vocal loudness immediately after LSVT LOUD. Maintenance at six-week follow-up varied across participants. A clinical report also documents outcomes for a preschooler and a young adult with cerebral palsy. |
| Parent-Based Group Early Language Interventions | Toddlers (mean age 27.5 months) from socially disadvantaged backgrounds with very small expressive vocabularies | A multicenter clustered blind RCT compared two parent-based group interventions aimed at improving early language development in children with expressive vocabularies of 40 or fewer single words from disadvantaged populations. |
Bilingual support that meets children in both languages differs sharply from intervention delivered only in English, and that contrast drives a federally funded research project now underway in Texas. The work signals where technology-assisted bilingual therapy may be heading, and SLPs tracking the field should understand both its promise and its current scope.
Researchers at Texas Christian University developed Computer-Assisted Bilingual Vocabulary Instruction (CABVI), a speech therapy app for kids designed for Latino Spanish-English bilingual children with developmental language disorder. The program uses stories, interactive games, and an AI-powered character to support vocabulary growth in both languages. Jean Rivera Pérez, an associate professor at TCU's Davies School of Communication Sciences and Disorders, leads the project alongside Emily Lund, whose research on early language intervention informed the app's design.
The National Institutes of Health, through the National Institute on Deafness and Other Communication Disorders, awarded the team a five-year grant totaling roughly $2.72 million.1 The study uses a randomized clinical trial design in Fort Worth community classrooms serving preschool through first grade.2
Rivera Pérez frames the rationale plainly: in Puerto Rico, interventions typically happen in a child's home language, while in the mainland United States they are almost always delivered in English. "If a child only receives interventions in English, they will be able to communicate with their teacher or certain members of their community, but not with their friends or their mom," she said.3
Lund offered a concrete example of the clinical stakes. She recalled working with a Spanish-speaking boy who had been shuttled between multiple providers because none spoke Spanish. "He did not have anybody who felt like they were the best person, because that person didn't exist," she said.3
A preliminary study published in April 2026 tested 21 Spanish-speaking preschoolers randomly assigned to one of three groups: bilingual CABVI (eight children), English-only CABVI (seven children), or business-as-usual services (six children).4 Results showed vocabulary gains in both Spanish and English, with improvements maintained at six months.3 The research team planned to begin expanded randomized clinical trials in January, with full findings expected after the five-year grant period and interim trend data possible around the halfway point.3
For SLPs and graduate students weighing how to become a bilingual speech pathologist, CABVI represents an emerging model: AI-assisted, dual-language, and school-embedded. Whether it scales beyond the initial trial will depend on replication, but the design offers a template worth following.
How can the profession serve millions of dual-language learners when fewer than one in ten SLPs speak more than one language?
The profession faces a growing tension between workforce capacity and clinical need. According to ASHA's year-end 2025 member data, only 8.8 percent of the association's 236,761 constituents identify as multilingual service providers. Among ASHA-certified SLPs specifically, that share is 8.6 percent. Meanwhile, developmental language disorder alone affects roughly 7 percent of children, and many of those children come from homes where English is not the primary language.
The shortage traces back to graduate training. Relatively few communication sciences and disorders programs offer dedicated Bilingual SLP Programs. SLP Clinical Placements that let students conduct assessments and deliver therapy in Spanish or other languages remain scarce in most regions. Students who enter programs already fluent in a second language often lack structured opportunities to develop clinical vocabulary and culturally responsive practices in that language.
This gap shapes the profession long before job postings go up. When programs do not prioritize bilingual training, fewer graduates emerge ready to serve dual-language caseloads, and the cycle continues.
The practical effects are felt in schools, clinics, and early intervention programs every day:
Regional variation compounds the problem. ASHA's state-level data shows Alabama, for example, with just 1.7 percent of its SLPs identified as multilingual, far below the national average.
For students weighing specialization options, bilingual proficiency represents one of the clearest pathways to high demand. Programs that do offer Spanish-language clinical rotations or coursework in culturally responsive assessment are worth seeking out. Employers increasingly prioritize candidates who can serve dual-language populations without relying on interpreters.
Speechpathology.org tracks program features across states, helping prospective students identify training options that align with this growing need.
The mismatch between the number of children who need bilingual language services and the clinicians equipped to provide them is stark. These three figures, drawn from ASHA workforce data and developmental language disorder prevalence research, frame the scale of the challenge for current and future SLPs.
Early identification is shifting toward brief, valid screeners that preschool teachers and education professionals can use, but the policy picture remains uneven: some states and systems are moving forward while national guidance stays cautious about universal screening. That tension is reshaping how SLPs enter the process.
A 2022 meta-analysis identified nine screening tools with good accuracy for developmental language disorder, and a 2024 ASHA review highlighted screeners meeting sensitivity and specificity thresholds above 80%. In practice, adoption varies. California requires local education agencies to adopt state-approved screening instruments beginning in 2025-26 under Education Code Section 53008,2 although that mandate may center on literacy and English language development rather than speech-language alone. Tasmania's 2024-2026 plan makes the Grammar and Phonology Screening Test available in all early learning environments.3 Digital tools are also moving in: LanguageScreen is designed for education professionals with automated scoring, and a 2025 study found preschool teachers could screen without a speech-language therapist present, though that finding is limited to study participants.4
Early identification lets SLPs shift from pull-out remediation to earlier language-rich intervention when neural plasticity and classroom routines support rapid gains. Children screened at age 2 who need support can receive family-centered strategies before school failure compounds. The USPSTF remains cautious about universal screening in asymptomatic children because evidence of net benefit is mixed,5 but for children already showing red flags, earlier screening shortens the gap between concern and targeted intervention. That changes intervention intensity and long-term trajectory more than waiting for a formal diagnosis.
Even when a communication disorder is identified, access to help isn't equal. A landmark study published in Pediatrics found Black children had roughly 40 to 60 percent lower odds of receiving speech-language services than otherwise similar White children, and children from non-English-speaking households fared just as poorly, an equity gap researchers say classrooms and clinics are still working to close.
Research findings only change outcomes when they reach the therapy room. For SLPs juggling caseloads across SLP career settings such as schools and clinics, the challenge is turning evidence-based intervention models into workflows that fit real schedules and real families.
Start by writing parent-implemented strategies directly into IEP goals and progress-monitoring plans, not as an afterthought but as a measurable component. If a child's plan calls for vocabulary growth, include a goal tied to caregiver-delivered practice at home, with a simple log or check-in built into the service schedule. This mirrors the logic behind tools like CABVI: intervention works best when it extends beyond the therapy session into daily language exposure.
Generic advice like "talk more to your child" rarely moves the needle, and it ignores what the CABVI and TCU research makes clear: children need rich language input in the language they actually use with the people closest to them. Family coaching should focus on specific, teachable interaction techniques such as expansion (repeating a child's phrase with added grammar), open-ended questions during shared reading, and labeling routines during daily tasks like cooking or errands, all delivered in the family's home language whenever possible. For clinicians who don't speak that language, this means partnering with interpreters trained in therapeutic coaching rather than relying on ad hoc translation.
Closing the access gap for dual-language families often requires restructuring how caseloads are built, not just adding more sessions. Grouping bilingual students for shared goals, prioritizing home-language screening before intervention planning, and scheduling regular caregiver-coaching blocks (rather than treating them as optional extras) can stretch limited bilingual staffing further. Some districts are experimenting with shared bilingual specialists who rotate across schools, paired with general caseload SLPs who reinforce home-language strategies between visits.
Where in-person bilingual staffing simply isn't available, an increasingly viable option is a blended model: telepractice sessions with a remote bilingual SLP combined with SLP AI tools like CABVI for supplemental practice between visits. This isn't a replacement for a qualified bilingual clinician, but it narrows the gap for children who would otherwise go without any home-language support at all. Clinicians considering this route should vet platforms for clinical evidence, ensure data privacy compliance, and treat AI tools as a complement to, not a substitute for, direct caregiver coaching and clinician judgment.
The throughline across all four strategies is the same: research on bilingual language development only helps kids when SLPs build it into daily practice, not just clinical theory.
Children who receive therapy only in English may gain classroom communication but lose the ability to connect with parents and siblings. Screening intake for home language use surfaces cases where a referral or co-treatment with a bilingual clinician changes outcomes.
In regions with few bilingual SLPs, technology-assisted vocabulary work can supplement in-person sessions rather than replace them. The tradeoff is training time and device access, but the alternative is often no home-language support at all.
Progress measured only in English can mask gains or losses in the child's stronger language and skew treatment decisions. Separate baselines for each language give a truer picture of whether intervention is building communication across a child's full world.
