Families often hear about behavioural and developmental therapies and wonder whether combining them offers any additional benefit. According to the NHS and NICE, interventions for autism should be personalised and focused on communication, participation and wellbeing rather than tied to a specific branded therapy. At present there is no distinct, manualised “ABA plus ESDM” hybrid that has been formally trialled against standard approaches.
Understanding the concept
Naturalistic Developmental Behavioural Interventions, summarised in the foundational review by Schreibman and colleagues, were created to blend applied behaviour-analytic strategies with developmental, play-based teaching. The Early Start Denver Model is one of the best-known NDBIs and is already a combined behavioural–developmental programme built from the Denver Model and PRT. Reviews such as Bruinsma and colleagues and the common-elements synthesis by Sandbank and colleagues describe how NDBIs integrate reinforcement, prompting and data-based decision making with child-led interaction and play.
Evidence and impact
Current evidence does not identify any trial in which a labelled “ABA plus ESDM” package is tested directly against ABA alone or ESDM alone. Most ESDM studies already incorporate behaviour-analytic learning principles, so they do not represent an “add-on” to ABA; instead they compare ESDM with community or eclectic early-intervention services.
Long-term ESDM work, including the sustained-outcome trial reported by Estes and colleagues, shows maintained or improving gains in communication and adaptive behaviour, but these results relate to ESDM itself rather than a hybrid model. Broader evidence across NDBIs reviewed by Schreibman et al and in the systematic analyses summarised by Bruinsma et al indicates consistent improvements in social communication and engagement, though trials remain modest in size and follow-up is limited.
A growing number of effectiveness–implementation studies are testing NDBI packages in real-world early intervention systems, such as the hybrid type I trial of CI-RIT, which focuses on caregiver responsivity and practical delivery rather than on formal ABA combination.
Practical support and approaches
UK guidance emphasises working with families to build communication, participation and everyday coping. NICE focuses on psychosocial and developmental support tailored to individual needs rather than recommending specific hybrid therapies. The National Autistic Society highlights the importance of communication environments, shared control, and reducing stress and misunderstanding principles closely aligned with NDBI models.
Challenges and considerations
Both ABA and NDBI studies face limitations. NDBI trials are typically small and often short in duration, while ABA literature focuses heavily on proximal learning outcomes and less on naturalistic participation or possible adverse experiences. No study to date isolates an added benefit from layering further ABA procedures on top of ESDM.
How services can help
In practice, families often receive mixed developmental and behavioural strategies within mainstream early years of settings. Services like Theara Change offer structured behavioural and psychological coaching that can complement broader developmental approaches, though not as a replacement for clinically delivered early-intervention programmes.
Takeaway
Current evidence shows that blended behavioural–developmental approaches already exist within NDBIs such as ESDM, but there is no established “ABA plus ESDM” hybrid therapy with its own trial evidence. Guidance from the NHS, NICE and the National Autistic Society continues to prioritise personalised, communication-centred and developmentally informed support rather than any specific hybrid model.
If you or someone you support would benefit from early identification or structured autism guidance, visit Autism Detect, a UK-based platform offering professional assessment tools and evidence-informed support for autistic individuals and families.
