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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 help to 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.

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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).
  • Scholastic 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 Testsystem (HTS). Scoring is free of charge (pricing is included with the printed test protocol) and no annual HTS license is required.

Continuous Norming allows for more precise calculations. The IDS-2 provides standardization data at one-month intervals, making printed booklets impossibly large. Hogrefe’s innovative NormViewer technology in HTS provides access to the calculated tables with just a few clicks.

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Reliability and Validity

Information on internal consistency and test-retest reliability is available in 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.

Click the button below to view and download the complete list of IDS-2 international validity tables.

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The IDS-2 has been standardized on children and adolescents aged 5:0 to 20:11 years in:

  • German: n = 1,672 in Germany, Austria, and Switzerland from 2015 to 2017
  • Dutch: n= 1,665 in the Netherlands from 2016 to 2017
  • Italian: n=1,111 in Italy from 2017 to 2019
  • U.K.: n = 1,372 in the U.K. from 2018 to 2020

Development is in progress in Czech, Danish, Finnish, French, Norwegian, Portuguese, Spanish, and Swedish.


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.

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Where to Buy

The IDS-2 is now available in UK English, Italian, Polish, Dutch and German, with additional adaptations due soon.

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Experience IDS-2

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

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