Conners 3rd Edition [CONNERS-3RD-EDITION]

The leading assessment of ADHD & comorbid disorders in children and youth ages 6 to 18

For ages: 6 to 18 (Parent & Teacher) or 8 to 18 (Self Report)
Administration Type: Parent, Teacher, Self
Administration Time: 10 to 20 minutes
Format: Online administration and scoring in MHS Assessment Centre+(MAC+), Hand scored
Author: C. Keith Conners, PhD.

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The Conners 3rd Edition™ (Conners 3®) is a thorough assessment of Attention-Deficit/Hyperactivity Disorder (ADHD) and its most common comorbid problems and disorders in children and adolescents aged 6 to 18 years. It is a multi-informant assessment that takes into account home, social, and school settings, with rating forms for parents, teachers, and youth. School psychologists, clinicians, psychiatrists, paediatricians, child protection agencies, and mental health workers can count on the Conners 3 to be a valid and reliable tool capable of supporting them in the diagnostic and identification process.

Key Features

  • Inform your ADHD diagnosis with results that have direct connections to DSM-5 symptom criteria and IDEIA legislation
  • Develop informed intervention and treatment strategies by identifying specific challenge areas to work on
  • Monitor response to intervention and its effectiveness with detailed progress reports
  • Assess common comorbid disorders (Oppositional Defiant Disorder and Conduct Disorder) to assist with differential diagnosis
  • Discover how ADHD symptoms are affecting the youth by looking at impairment items which indicate functioning in home, school and social settings
  • Spend less time on paperwork and more time with the youth with fast and easy to use administration and scoring, and easy to interpret reports
  • Gain a multi-rater perspective of the youth’s difficulties with a Parent, Teacher, and Self-report version

about the author

Dr. Keith Conners

C. Keith Conners, Ph.D., had an extraordinary and divers career as an academic, clinician, researcher, lecturer, author, editor-in-chief, and administrator. His dedication to the study of ADHD and other childhood problems propelled him to the forefront of his field where he was often called, “the father of ADHD”. He was highly recognised in the field of psychology by his numerous contributions and left behind a lasting legacy of work.

What is adhd?

What do you do when there is a child in your classroom who can’t ever seem to pay attention? Or a teen with little patience and no end of energy? It can be a difficult task to define the difference between average childhood behaviour and what could be a clinical disorder. Attention-Deficit/Hyperactivity Disorder or ADHD negatively impacts functioning both at home and at school. Characterized by inattention, hyperactivity, and impulsivity, a child with ADHD can be easily distracted, have a hard time focusing on a specific task or topic, fidget, and have trouble with patience or waiting. Left untreated, ADHD can lead to impaired social and emotional development, difficulty at school and home, and overall disruptive behaviour.

What is the conners 3?

The Conners 3rd Edition™ (Conners 3®) is the product of over 40 years of research on
childhood and adolescent psychopathology. It is a thorough and focused assessment of
ADHD and its most common comorbid disorders in children and adolescents between 6 and
18 years of age. The Conners 3 is invaluable when making decisions about clinical diagnoses
and educational eligibility, during intervention planning and monitoring, in research contexts, and for screening purposes.
But we know one size doesn’t necessarily fit all when it comes to individual and comprehensive assessment. In order to help tailor your assessment needs to both your practice and the children in your care, the Conners 3 is available in several forms. In addition to the Full-Length forms, the Conners 3 also has Short forms, an ADHD Index, and a Global Index.


Discontinuation of Conners 3rd Edition Paper Products

Notice to all PAA customers. Please be advised that Multi-Health Systems Inc. (MHS) are actively moving towards digital solutions and are making changes to the availability of the Conners 3rd Edition (Conners 3®) paper products currently in use.

Conners 3 Full-Length

Number of items:

  • Parent 110
  • Teacher 115
  • Self-Report 99

The Conners 3 Parent, Teacher, and Self-Report full-length reports closely parallel each other and include every Conners 3 item. These reports convey the most detailed information of all the reports and include Content scales, DSM-5 Symptom scales, Conners 3AI, Conners 3GI, Anxiety and Depression Screener items, Severe Conduct Critical items, Validity scales, Impairment items, and Additional Questions. Conners 3 Parent and Teacher reports are used to rate youth 6-18 years, and the Self Report can be completed by youth 8-18 years.

Conners 3 Short

Number of items:

  • Parent 45
  • Teacher 41
  • Self-Report 41

The Short versions of the Conners 3 forms are a subset of items from the Full-Length assessment. They include the items from the Conners 3 Content Scales, the Positive Impression and Negative Impression scales, and an opportunity to express the child’s strengths and any other concerns the rater may want to share (the DSM-5 Symptom scales are not included). The Short forms are useful when administration of the full-length version is not possible or practical (e.g., due to limited time or when multiple administrations over time are desired).

Conners 3 ADHD Index (AI)

Number of items:

  • Parent 10
  • Teacher 10
  • Self-Report 10

For the Conners 3 AI, the index contains the 10 items that best differentiate youth with ADHD from youth in the general population. It is useful as a quick check to see if further ADHD evaluation is warranted, particularly for pre-evaluation or group screening purposes. This index is available in parent, teacher, and self-report formats.

Conners 3 Global Index (GI)

Number of items:

  • Parent 10
  • Teacher 10

For the Conners 3 GI, the index contains the 10 most predictive items from the original Conners Parent and Teacher Rating Scales with updated normative data. This index is useful for monitoring treatment effectiveness and changes over time. This index is available in parent and teacher formats.

More than just adhd

Conners 3 is a recognised staple in ADHD assessment, but the test is designed to reflect more than just ADHD symptoms. In fact, ADHD is often associated with one or more comorbid disorders, associated features, and functional impairments. Within the test, scales that relate directly to the DSM-5diagnostic criteria are included for ADHD, as well as scales for the most common co-occurring disorders including Conduct Disorder and Oppositional Defiant Disorder. The C3 also features Severe Conduct Critical items, as well as Screener items for Anxiety and Depression, two internalizing problem areas frequently associated with ADHD.

Three Valuable Report Options

Assessment Reports

Provide detailed information about scores from a single administration, presented both numerically and graphically. An individual’s scores are compared to those in the normative sample and elevations at the scale and subscale level are indicated.

Progress Reports

Compare the results of two to four administrations for the same individual to measure changes over time. These reports are ideal to use when monitoring treatment and intervention effectiveness.

Comparative Reports

Combine the results of different raters to provide an overview of an individual’s scores from a multi-rater perspective. This highlights potentially important inter-rater differences in scores.


The Conners 3rd Edition (Conners 3) has been updated to provide a new scoring option for the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) Symptom Scales.

Complete information on all psychometric properties can be found in the Conners 3rd Edition Manual and DSM-V Supplement.

Online administration in MHS Assessment Center + (MAC+) 

Assessing online has never been easier with the new MHS Online Assessment Center +. Experience the new online platform designed with clinicians for clinicians to ensure the easiest, fastest and most accurate assessing possible!

Why use the Conners 3 online?

  • Save time – fast, easy and accurate administration with automated scoring
  • Assess and score from anywhere – enjoy the convenience of viewing reports from your home, office or anywhere with an online connection
  • Improve efficiency and accuracy – when items are absent, prompts appear to ensure information is not missed
  • User friendly – easy to use interface for practitioners and respondents
  • Gain information easily – email a link to the form directly to the respondent
  • Tailored organisation – data can be customized to how you work
  • Benefit from significant cost savings – don’t purchase paper forms in bulk ever again

Download full list of assessments available in the MHS Online Assessment Center+