Is The ACCEPT Approach Evidence-Based?

I have lost count of the number of times professionals have questioned acceptance-based support. Recently, I was asked by a child mental health Psychologist during a Child In Need meeting: “Is your approach evidence-based?”.

At Accepting Behaviour, we are sometimes misunderstood, and I would like to address the misconceptions of acceptance-based support. To begin with, these misconceptions are not caused by our work’s lack of impact. It is because we follow a social model approach to learning and support: one that challenges traditional frameworks and places acceptance at the centre of everything we do.

Acceptance-based support is still relatively unknown in mainstream education. Many professionals have never encountered it in training or practice. So when we share stories of students re-engaging, speaking after years of silence, or letting go of self-harming behaviours, the reaction is often scepticism. Not because the outcomes are not real, but because the approach is unfamiliar.

Yet there is nothing radical or new about what we are doing.

The foundations of our practice are rooted in well-established psychological theory. Maslow’s hierarchy of needs, Carl Rogers’ humanistic principles, and constructivist learning models all emphasise the importance of emotional safety, personal meaning, and authentic connection. This is not an ideology. It is a practical, evidence-based response to a system that often fails the very children it claims to support.

For a specific group of young people, our support works

We have seen completely disengaged students begin to speak, learn, and connect. Families who felt lost now feel hopeful. Professionals who were unsure are now asking for training and collaboration.

The real issue is not whether acceptance works. It is whether the system is ready to acknowledge that what works might look very different from what has always been done.

When people ask ‘Where’s your evidence?’ they usually mean quantitative data—numbers, spreadsheets, graphs. However, in education, and especially in autism support, we also need to consider qualitative evidence—lived experience, emotional growth, and individual transformation.

Many professionals usually want quantitative evidence, data sets, numbers, graphs, etc. This reflects a common assumption in education: measurable outcomes are the most reliable proof. While I do not dismiss the value of quantitative data, I argue that this demand is limiting, especially in the context of supporting autistic students. When evaluating the effectiveness of an approach like The ACCEPT Approach, we must consider qualitative evidence, which captures emotional growth, relational shifts, and individual transformation.

Quantitative data can only measure what is easily countable. In contrast, qualitative evidence captures complexity, nuance, and personal experience. For example, when a previously disengaged student begins to initiate communication or a selectively mute young person begins to use complete sentences, these are clear and meaningful indicators of progress. Yet such outcomes are not always captured through standardised assessments or behavioural tracking systems.

Moreover, quantitative tools are not always appropriate for the students I support. Many of them are highly anxious, have demand avoidance issues and are usually traumatised by past school experiences. They often resist direct questioning, disengage from formal assessments, or experience distress in test-like environments. Standard tools for data collection are simply inaccessible or irrelevant to their lived realities. These students are often misrepresented or excluded when progress is measured only by academic attainment or behavioural compliance. In contrast, qualitative methods, such as detailed observations, case study analysis, and narrative accounts, allow us to understand progress in context and from the student’s perspective.

Importantly, qualitative research is no less rigorous than quantitative research. It is suited to different aims. Tracy (2010) outlines key markers of high-quality qualitative research, including credibility, transferability, dependability, and confirmability. These markers provide the basis for robust, evidence-based practice that is particularly well-matched to relational and developmental interventions. Likewise, Denzin and Lincoln (2018) argue that qualitative inquiry is essential for understanding the layered, emotional, and social dimensions of human experience—dimensions that are often central in educational and therapeutic contexts.

Another key reason for privileging qualitative evidence in autism support is the need to centre autistic voices. Historically, autism research has been conducted on, rather than with, autistic individuals. Quantitative studies often operationalise autistic traits as deficits to be measured or corrected. In contrast, qualitative approaches are better placed to include autistic perspectives, capture subjective experiences, and uphold principles of neurodiversity. Milton’s (2012) work on the “double empathy problem” highlights the mutual misunderstanding between autistic and non autistic people, a concept that cannot be explored meaningfully through standardised measures alone. If we are to build genuinely inclusive approaches, we must embrace methodologies that value narrative, lived experience, and relational insight.

In educational support for autistic students, progress is often non-linear, deeply personal, and context-dependent. A child moving from fear to trust, from shutdown to engagement, or from self-blame to self-understanding cannot be captured fully in a data point. The ACCEPT Approach is grounded in human connection, emotional safety, and unconditional acceptance. These are not easily measured, but they are deeply evidenced in lived experience, in practitioner reflections, and in student narratives. If we are serious about building effective, ethical, and inclusive educational practice, we must widen our definition of evidence to include the qualitative, not dismiss it.

What Research Says about ‘reliable’ evidence.

To be clear, I am not opposed to quantitative evidence. I am, however, critical of narrow, traditional definitions of what constitutes evidence in educational practice. Quantitative research provides breadth and generalisability, but it often fails to capture the nuanced experiences of students like those we support—young people with complex trauma histories, high levels of anxiety, or demand avoidant profiles. These learners do not conform to standardised metrics or behaviour charts and are frequently excluded from the very evidence base used to shape policy and practice.

According to NICE (2022), evidence-based practice is not just about research trials. It is a combination of:

• Best available evidence
• Practitioner expertise
• And the values and preferences of the individuals being supported

If we ignore the last two, we are not practising ethically. And we are certainly not practising in a neurodivergent-affirming way.

Guldberg et al. (2019) highlight that autistic students benefit most from flexible, child-centred approaches. However, these are hard to measure using traditional qualitative research methods.

And as Woods (2019) argues, behaviourist models like ABA still dominate despite growing concerns that they undermine autonomy, internal motivation, and emotional wellbeing.

Our Case Studies: Evidence I am Proud Of.

Accepting Behaviour has a fantastic team of specialist educators. As we continue to support our students, we have so many stories where we have seen the impact of acceptance-based support. Here is some recent feedback from parents accessing our support.

The Twins Who Found Their Voice

Take the case of two young autistic twins we began supporting last year.

Both young people were selectively mute. For years, they only spoke to their mother. Every previous setting had not known how to help them engage in learning. None of them worked, and instead, they often heightened their anxieties, making them withdraw even further.

When we first met them, we did not ask them to speak. We did not set targets. Instead, we offered something they had never been given: full autonomy. They had complete control over what they wanted to do in our sessions. If they wanted to walk, we walked. If they just wanted to sit, we sat.

Trust took time. But we never rushed it.

We showed up consistently. We accepted them exactly as they were. We respected their space and followed their lead. Slowly, the anxiety began to reduce. They began to want to engage with us. Then came the smiles, and the bird watching!

These two young people are now engaged in our sessions, mostly birdwatching, three times a week. They leave the house regularly and travel across the West Midlands in search of rare birds—something unimaginable a year ago. They are curious, passionate, and visibly more at ease in the world around them.

Their parents recently shared:

“Before Accepting Behaviour’s support, they rarely spoke, would not engage with anyone, and were extremely socially anxious. They had little interest in anything. Now, they are socially a lot more confident and happier in themselves. Amazing! They are like different people since Accepting Behaviour came into their lives. I’m not sure where we would be without you. You have had a positive impact on the whole family.”

As a team, we believe this is what acceptance does. It changes lives, not by trying to fix children, but by seeing them, trusting them, and meeting them exactly where they are.

The Girl with Her Suicide Box

Another autistic young person we work with has a history of trauma and deep emotional distress, specifically around school. She had been withdrawing from school and was not engaging well with the mental health support offered. She hardly left her house, only being able to stay in her room for most days.

When I met her, I did not know that she kept a small box hidden away, and that inside were items she planned to use when she had, in her words, “had enough.”

I started our sessions and focused on applying acceptance to all we did. She was told she was ‘the boss’ of her sessions, and I would only do what she wanted. She also knew she did not have to engage in any sessions where she felt she could not. I also applied the Four Foundations of acceptance (This is part of the ACCEPT Approach). I REMOVED whatever made her anxious, and REMINDED her at every session that her struggles were ‘not her fault’, something that I did not realise would have such a profound impact on her.

I reminded her that she mattered—and that none of this was her fault. I showed up, week after week, without demands or conditions. Over time, she began to trust me. Slowly, her walls came down. She spoke more, smiled more, and started exploring things she used to enjoy.

And then, one day, she handed the box to her mother and said:

“I do not need this anymore. I know it is not my fault.”

That moment did not come from a structured learning programme or a behavioural modification strategy. It came from feeling accepted, truly and unconditionally.

The First Hug in Thirteen Years

One teenage boy we supported had never been able to express affection physically and had not once hugged his mother in thirteen years. At the time of referral, he was at imminent risk of exclusion, exhibiting high levels of emotional distress and disengagement from education.

Through consistent, acceptance-based support—delivered at his pace and on his terms—he gradually began to build trust and emotional safety. Several weeks into our work together, he initiated a hug with his mother for the first time in his life. While such progress cannot be easily quantified or represented in traditional data sets, its significance is undeniable to those who work closely with neurodivergent students.

“He has hugged me for the first timne in 13 years!” Mother.

Importantly, this is not an isolated outcome. It reflects a broader pattern we have observed across multiple students whose needs have historically been unmet by compliance-driven models of support. This was the direct result of an approach built on acceptance, autonomy, and deep human connection.

“But You’re the One Presenting the Evidence…”

Another criticism I sometimes hear is this:

“Yes, but you are the one presenting the findings. That’s a conflict of interest!.”

I understand where that is coming from. But here’s my response:

‘Of course, I am presenting the findings, because I am the one doing the work.‘

That is no different from a researcher in a lab sharing their results, or a school sharing outcomes from their own internal tracking. Every teacher, therapist, or clinician collects and reports on their own data. The key is transparency, accountability, and reflection. We are not claiming to be neutral observers. We are active practitioners, embedded in the work. We reflect, record, track outcomes, and review progress constantly, with the input of students, families, and other professionals.

Many Foundational Theories Were Based on Small Samples

When new approaches challenge established practice, professionals often demand large-scale, quantitative evidence before considering them valid. While this caution is understandable, it overlooks a vital truth: many of the most influential theories in psychology, education, and autism support began with small sample sizes, individual case studies, or practitioner reflections. Innovation in these fields has rarely started with numbers—it has started with insight. The following examples illustrate how widely accepted frameworks were built not on spreadsheets, but on close observation and individual transformation.

• Jean Piaget developed his theory of cognitive development by closely observing his own children. His qualitative, detailed case studies formed the basis of stage theory used in education for decades (Piaget, 1952).
• Sigmund Freud grounded psychoanalytic theory in a handful of detailed case studies—such as Little Hans and the Rat Man. These cases were not statistically representative but opened entirely new fields of inquiry (Freud, 1909).
• Lev Vygotsky, whose concept of the Zone of Proximal Development is widely used in education, also relied heavily on observation and analysis of individual learners, rather than experimental trials or large samples (Vygotsky, 1978).
• Carol Gray, the creator of Social Stories, developed this now-widely used approach while working with a single autistic student in 1991. From that initial story and reflection grew a global framework for supporting social understanding in autistic children (Gray, 2010).
• Lorna Wing, whose work led to the identification of the “autism spectrum” concept, based her early theories on detailed clinical descriptions and case work, including observational data from just a few families (Wing and Gould, 1979).
• Hans Asperger’s initial paper in 1944 described only four boys in detail, yet this small sample was the foundation of what became “Asperger’s syndrome” in later diagnostic systems.

Large-scale studies require funding, access, and time—but ideas often emerge first from insight, relationship, and reflection. Many important frameworks started as a response to what one child needed, what one teacher observed, or what one clinician noticed.

In that sense, the ACCEPT Approach stands in a long tradition of practice-led innovation. Grounding it in detailed case studies, qualitative evidence, and lived experience is not a weakness—it is the starting point of real-world relevance. As with any emerging framework, rigorous documentation and continued reflection can later lead to more formal research and broader validation.

In Conclusion

Here is what I say when professionals ask me if we are evidence-based:

“Yes, we are. We use qualitative and quantitative evidence. Our success rate is over 95%. We have case studies showing emotional breakthroughs, speech development, and recovery from trauma. Traditional methods failed these students. Our model has transformed their lives. That is evidence—and it is time we redefined what counts.”

But I also say this:

“Evidence-based does not mean behaviourism. It does not mean compliance. It means doing what works, for the person in front of you, and being accountable for the outcomes.”

If that is controversial well I am fine with being compared to Marmite.

Please feel free to leave any comments on this topic below.

Thanks,
Aaron.

References

• Crane, L., Adams, F., Harper, G., Welch, J., & Pellicano, E. (2021). ‘Something needs to change’: Mental health experiences of young autistic adults in England. Autism, 25(3), 776–791. https://doi.org/10.1177/1362361320961900
• Guldberg, K., Parsons, S., MacLeod, A., Jones, G., Prunty, A., & Balfe, T. (2019). Implications for practice from international experiences of educating children with autism. European Journal of Special Needs Education, 34(3), 395–409. https://doi.org/10.1080/08856257.2018.1435010
• Kapp, S. K., Gillespie-Lynch, K., Sherman, L. E., & Hutman, T. (2013). Deficit, difference, or both? Autism and neurodiversity. Developmental Psychology, 49(1), 59–71. https://doi.org/10.1037/a0028353
• Milton, D. (2012). On the ontological status of autism: The ‘double empathy problem’. Disability & Society, 27(6), 883–887. https://doi.org/10.1080/09687599.2012.710008
• Milton, D., & Sims, T. (2016). How is a sense of well-being and belonging constructed in the accounts of autistic adults? Disability & Society, 31(4), 520–534. https://doi.org/10.1080/09687599.2016.1186529
• NICE. (2022). Evidence-based practice. National Institute for Health and Care Excellence. https://www.nice.org.uk/about/what-we-do/evidence-based-guidance
• Woods, R. (2019). Pathologising children through the behaviourist lens of ABA? Disability & Society, 34(7–8), 1141–1146. https://doi.org/10.1080/09687599.2019.1626004
• Denzin, N.K. and Lincoln, Y.S., 2018. The SAGE Handbook of Qualitative Research. 5th ed. Thousand Oaks, CA: SAGE Publications.
• Milton, D.E.M., 2012. On the ontological status of autism: The ‘double empathy problem’. Disability & Society, 27(6), pp.883–887. https://doi.org/10.1080/09687599.2012.710008
• Tracy, S.J., 2010. Qualitative quality: Eight “big-tent” criteria for excellent qualitative research. Qualitative Inquiry, 16(10), pp.837–851. https://doi.org/10.1177/1077800410383121
• Freud, S., 1909. Analysis of a Phobia in a Five-Year-Old Boy (Little Hans). In: The Standard Edition of the Complete Psychological Works of Sigmund Freud, Volume X. London: Hogarth Press.
• Gray, C., 2010. The New Social Story Book. Arlington, TX: Future Horizons.
• Piaget, J., 1952. The Origins of Intelligence in Children. New York: International Universities Press.
• Vygotsky, L.S., 1978. Mind in Society: The Development of Higher Psychological Processes. Cambridge, MA: Harvard University Press.
• Wing, L. and Gould, J., 1979. Severe impairments of social interaction and associated abnormalities in children: Epidemiology and classification. Journal of Autism and Developmental Disorders, 9(1), pp.11–29.

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