menu Created with Sketch. close Created with Sketch.


A global measure designed to identify children’s knowledge, strengths and areas for development, the IDS-2 offers the most comprehensive diagnostic assessment available.


The IDS-2 is standardized in each language on children and adolescents ages 5-20 years. This comprehensive assessment can be used to identify and diagnose intellectual disabilities and learning disorders, as well as evaluating cognitive and motor skills, and emotional strengths and weaknesses.


The scientific basis of the IDS-2 has been explored in numerous research articles over the past decade, with a focus on the cognitive and developmental needs of children.

Read More

Modular Administration

The IDS-2 has a modular design so that each assessment session covers the areas needed in an individual way. Testing times (approximate) are:

  • Intelligence: IQ screening (10 minutes); IQ general (50 minutes); IQ complete profile (90 minutes).
  • Executive Functions (30 minutes).
  • Psychomotor Skills (20 minutes).
  • Social-emotional Skills (15 minutes).
  • Basic Skills (according to age 30-60 minutes).
  • Motivation and Attitude (7 minutes).

Online Scoring

The IDS-2 is scored using the state-of-the-art continuous norming process via the online Hogrefe Test System 5 (HTS 5). Scoring is free of charge (pricing included with the printed test protocol) and no annual HTS-license is required.

Reliability and Validity

Information on internal consistency and test-retest reliability is available on all languages. Studies are available on construct validity with various assessments (e.g. IDS, WIS-IV, M- ABC-2), on criterion validity (e.g. with school performance) and on differential validity (e.g. ADHD, autism spectrum disorder, intelligence impairment, exceptional talent) depending on the language.


The IDS-2 has been developed and published in:

  • German: 1,672 children and adolescents aged 5:0 to 20:11 years old tested in Germany, Austria and Switzerland from 2015 to 2017.
  • Dutch: 1,665 children aged 5:0 to 20:11 years old tested in the Netherlands from 2016 t0 2017.

Development is in progress in Italian, UK English, Portuguese, Swedish, Norwegian, Finnish, and Danish.


The IDS-2 approach to intelligence uses the Cattell-Horn-Carroll theory. Covering verbal and abstract thinking, short and long-memory, and visual processing and processing speed, scores can be calculated using two, seven or fourteen subtests.

Read more

Where to Buy

The IDS-2 is now available for purchase in Dutch, German and Polish, with additional language adaptations in development.

Read more

Experience IDS-2

Our team is eager to help professionals around the world understand the IDS-2 at international and national conferences and meetings.

Read more