Developmental,
Dimensional and
Diagnostic Interview for autism assessment
Introducing the 3di6, a major update to the 3di computerised interview that has been in worldwide use for over 20 years. Designed for trained clinicians, the 3di supports a conversational parent or carer interview while preserving the structured responses needed for dimensional assessment, review and reporting.
3di key features
An integrated framework for a detailed clinical conversation, from interview to report.
Increased clinical efficiency
A screening interview can be completed in as little as 45 minutes. Alternative routes through the 3di6 allow clinicians to seek detailed structured information about problem areas.
DSM-5 compatible
Computerised analysis of the structured clinical interview generates DSM-5 equivalent measures in 7 major domains and 27 subdomains, facilitating identification of relative strengths and weaknesses across the entire autism spectrum.
Automated reporting
The 3di6 generates a detailed and structured report of the clinical information gathered, together with an automated analysis, in a format that reads like a clinic letter. This facility can save hours of time for busy clinicians.
Dimensional assessment
Measures the severity of features associated with autism, not only the presence or absence of a diagnosis.
ADHD and co-occurring conditions
Alongside autism, the 3di6 assesses ADHD and a range of co-occurring conditions, including anxiety, depression, OCD and tics.
Established evidence base
The 3di method has a published research history covering development, reliability, validity and use in different settings. Browse the research bibliography
3di at a glance
- Age range
- 2–25 yearsChildren, teenagers and young adults
- Administration time
- 45–150 minutesBrief to full interview
- First publication
- 2004First peer-reviewed 3di paper in JAACAP
- International coverage
- 10 languagesTranslations and published research
Developed by clinicians who have worked at the Institute of Child Health, University College London, and Great Ormond Street Hospital for Children, London.
In active development
A modern workspace for the 3di clinical interview
The 3di6 is a cloud-based application for Windows and Mac that rebuilds the 3di for today’s clinics. It’s computerised throughout, so every assessment follows an evidence-based, algorithm-driven process, with guided interviewing, review and reporting in one place.
Register your interestOne interview.
A clear clinical pathway.
The 3di guides clinicians through sections and subsections of carefully ordered questions, while retaining the flexibility needed for a natural clinical conversation.
Take the product tourPatients and assessments
Search by patient or assessment reference, filter by assessment status and pick up any assessment where you left off.
Explore patients and assessmentsInterview routes
Assess autism, ADHD or both, then choose between longer and shorter interview routes to fit the time you have.
Explore the guided interviewAutomated reports
Generate a clinician report and a parent letter straight from the interview, ready for you to review and finalise.
Explore reports
Get the 3di6 now.
Be among the first to use the new 3di6 platform, and arrange training for you or your team.