The 5-Step Differential Diagnosis Method

An evidence-based approach to differential diagnosis for autism and ADHD assessments, built for the cases that don’t fit neatly into a single explanation.

Differential diagnosis is often taught as a checklist exercise, but real clinical complexity rarely works that way. This session introduces Amanda’s own 5-step method, developed specifically for situations of genuine diagnostic complexity, where several explanations are plausible and autism and ADHD are difficult to separate from other presentations. You’ll leave with a clear, repeatable framework you can apply directly to your next complex case.

This session is part of the Advanced Diagnostic Practice Series, six planned trainings over the coming year, with each session exploring a different part of assessment and diagnosis that clinicians often find difficult.

Sessions are stand-alone, so there’s no need to attend in order or attend them all. New topics will be announced as they become available. Join the waitlist to be first to know about new releases in this series.

By the end of this session, you will be able to:

• Understand what differential diagnosis is and why it matters in complex presentations
• Understand the universal differential diagnosis method used across the DSM, and why this isn’t always workable in complex diagnostic assessments or with neurodivergent presentations
• Apply Amanda’s 5-step method to cases involving multiple potential explanations, including autism and ADHD presentations that are difficult to tease apart from other presentations
• Apply this framework to your own complex cases with greater clarity and confidence

This is a live, online webinar hosted on Zoom, with approximately 90 minutes of content followed by 30 minutes of live Q&A with Amanda.

Registration includes both live attendance and the recording, available for 90 days following the event. If you can’t attend live, you’re welcome to submit questions in advance, and these will be answered anonymously during the Q&A.

Registration is for individual access only. If you have a group of 5 or more who’d like to attend together, please get in touch to discuss group practice rates.

CPD/CE hours: 2 CPD/CE hours. A certificate of completion is provided following completion of the training.

This webinar is suitable for psychologists and allied health professionals who want to strengthen their assessment and diagnostic skills, particularly those with some foundational knowledge of autism and ADHD diagnostic assessment.

Differential diagnosis is an advanced skill in assessment practice, and this training is built to fill that gap. It’s relevant whether you’re new to differential diagnosis and want a solid, repeatable framework to work from, or you’ve done foundational training before and want to apply it to real case complexity.

Worth noting: this method was first taught inside Amanda’s Differential Diagnosis: A Spotlight on Neurodivergence training, which covers differential diagnosis across a broader range of presentations, including complex trauma, intellectual disability, attachment disorders and personality disorders.

If you’ve completed that training, this webinar goes further. It spends the full session on my 5-step method, with case examples and practical strategies for implementing it in your own practice, something the original training didn’t have time to cover in depth.

If you haven’t completed the Differential Diagnosis: A Spotlight on Neurodivergence training, it’s a great starting point, but it isn’t necessary to get value from this webinar.

Amanda Moses is dually registered as a Psychologist in Australia and a Clinical and Counselling Psychologist in the UK, with over 14 years of experience in complex psychological assessment and diagnosis. She has trained thousands of psychologists and allied health professionals internationally, and has presented as a keynote speaker and invited guest at conferences across the field.

Amanda is currently completing her PhD, researching diagnostic barriers and practices for less observable autistic presentations, work that sits at the heart of the diagnostic complexity this series addresses.

She’s built her career on grounding clinical training in genuine evidence and neurodiversity-affirming principles, without losing the clinical rigour that complex assessment work demands.