PDA Assessment in Autism: EDA-Q and EDA-8 Explained

PDA EDA-Q and EDA-8 Explained

If you have been searching for information on PDA assessment, you may have come across terms such as the EDA-Q (Extreme Demand Avoidance Questionnaire) and the EDA-8. These tools are often referenced when discussing demand avoidance, yet there can be confusion around what they are, how they are used, and whether they provide a diagnosis.

This blog provides a clear, neuroaffirmative explanation of:

• The role of the EDA-Q and EDA-8 questionnaires

• What these tools can and cannot tell us

• How they relate to the lived experience of demand avoidance

What Is the EDA-Q (Extreme Demand Avoidance Questionnaire)?

The EDA-Q is a research-based questionnaire developed by Dr. Elizabeth O’Nions and colleagues in 2013. It was created to help identify behaviours associated with extreme demand avoidance in children.

The questionnaire:

• Is typically completed by parents or caregivers

• Includes a series of statements about behaviour

• Uses a rating scale to indicate how often behaviours occur

It was designed to measure patterns such as:

• Resistance to everyday demands

• Strong need for control and autonomy

• Use of strategies to avoid expectations

• Emotional responses linked to perceived pressure

You can explore the original EDA-Q here.

What Is the EDA-8?

The EDA-8 is a shorter, refined version of the EDA-Q, developed through further research.

It:

• Includes 8 key items

• Focuses on the most consistent indicators of demand avoidance

• May be easier to use in both research and practice contexts

You can access the EDA-8 here.

EDA-Q and EDA-8 are screening and research tools

A key point for anyone exploring PDA assessment is that:

• The EDA-Q and EDA-8 are screening and research tools

• They do not diagnose PDA or Autism

• They are used to identify patterns and traits, not provide clinical conclusions

They are most useful when:

• Used alongside professional assessment

• Interpreted within the child’s broader context

• Considered as part of a holistic understanding

What Do These Questionnaires Tell Us About PDA?

The EDA-Q and EDA-8 highlight an important shift in understanding behaviour.

Rather than viewing behaviour as:

• Refusal

• Non-compliance

• Opposition

They support understanding behaviour as a response to:

• Perceived demand

• Threat to autonomy

• Nervous system activation

For many Autistic individuals with a demand avoidant profile:

• Everyday expectations can feel overwhelming

• Even positive interactions, such as praise, can be experienced as pressure

• Avoidance strategies are often protective, not intentional

Continue Exploring PDA

Understanding pressure is one part of the wider picture.

You may also find these Little Puddins guides helpful:

• What is PDA? Learn about the characteristics of a Persistent Drive for Autonomy and why it is understood differently from traditional behaviour-based models.

• PDA Parenting Guide Explore practical, neuroaffirmative approaches to supporting everyday life at home.

• Declarative Language Discover how communication styles can influence autonomy, regulation and connection.

• PDA and School Understand how classroom environments, expectations and relationships shape participation.

• Autistic Burnout and Regulation Learn how accumulated stress can affect capacity across home, school and community.

Disclaimer

This post is for informational and educational purposes only. The EDA-Q and EDA-8 are research-based tools and not diagnostic instruments. Every individual is unique, and interpretation should always be considered within the context of the person’s lived experience.

References:

Pathological Demand Avoidance (PDA) and the Nervous System:

1. Foundational Understanding of PDA:

• Newson, E., Le Maréchal, K. and David, C. (2003) ‘Pathological demand avoidance syndrome: a necessary distinction within the pervasive developmental disorders’, Archives of Disease in Childhood, 88(7), pp. 595–600. Available at: https://adc.bmj.com/content/88/7/595 (Accessed: 1 February 2025).

• Johnson, M. and Saunderson, H. (2023) ‘Examining the relationship between anxiety and pathological demand avoidance in adults: A mixed methods approach’, Frontiers in Education, 8, Article 1179015. Available at: https://www.frontiersin.org/articles/10.3389/feduc.2023.1179015/full (Accessed: 2 February 2025).

• O’Nions, E., Happé, F., Viding, E. and Noens, I. (2021) ‘Extreme demand avoidance in children with autism spectrum disorder: Refinement of a caregiver-report measure’, Advances in Neurodevelopmental Disorders, 5(3), pp. 1–13. Available at: https://link.springer.com/article/10.1007/s41252-021-00203-z (Accessed: 1 February 2025).

• O’Nions, E., Christie, P., Gould, J., Viding, E. and Happé, F. (2014) ‘Development of the “Extreme Demand Avoidance Questionnaire” (EDA-Q): Preliminary observations on a trait measure for pathological demand avoidance’, Journal of Child Psychology and Psychiatry, 55(7), pp. 758–768. Available at: https://acamh.onlinelibrary.wiley.com/doi/10.1111/jcpp.12149 (Accessed: 2 February 2025).

2. Neurophysiological Perspectives:

• Porges, S.W. (2011) The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-Regulation. New York: W.W. Norton & Company.

• Porges, S.W. (2001) ‘The polyvagal theory: phylogenetic substrates of a social nervous system’, International Journal of Psychophysiology, 42(2), pp. 123–146.

3. Insights for PDA Practitioners:

• O’Nions, E., Happé, F., Viding, E. and Noens, I. (2021) ‘Extreme demand avoidance in children with autism spectrum disorder: Refinement of a caregiver-report measure’, Advances in Neurodevelopmental Disorders, 5(3), pp. 1–13. Available at: https://link.springer.com/article/10.1007/s41252-021-00203-z (Accessed: 1 February 2025)

• Haire, L., Symonds, J., Senior, J. and D’Urso, G. (2024) ‘Methods of studying pathological demand avoidance in children and adolescents: A scoping review’, Frontiers in Education, 9, Article 1230011. Available at: https://www.frontiersin.org/articles/10.3389/feduc.2024.1230011/full (Accessed: 1 February 2025).

4. Neuroscience and Trauma-Informed Perspectives:

• Porges, S.W. (2009) ‘Reciprocal influences between body and brain in the perception and expression of affect: A polyvagal perspective’, The Healing Power of Emotion: Affective Neuroscience, Development & Clinical Practice, pp. 27–54.

5. Real-World Lived Experience and Clinical Application:

• Christie, P. (2018) ‘PDA… the story so far’, PDA Society Resources. Available at: https://www.pdasociety.org.uk/resources/phil-christie-pda-the-story-so-far/ (Accessed: 1 February 2025).