Members area



Don't have a login?

Join us

Become a member

  • Connect with others through events, workshops, campaigns and our NEW online forum, Your Community
  • Discover information and insights in our resource hub and receive the latest updates via email and Families magazine
  • Access one-to-one support and tailored services which help reduce barriers for deaf children
  • Borrow technology and devices which support deaf children’s communication and independence
Menu Open mobile desktop menu

Wechsler Preschool and Primary Scale of Intelligence, Fourth UK Edition (WPPSI-IV)

The Wechsler Preschool and Primary Scale of Intelligence, Fourth UK Edition (WPPSI-IV) is a measure of cognitive development for pre-school and young children, administered using paper and pencil. It gives us a measure of cognitive ability in young children, compared to their peers. It has been developed to be accessible to young children with child-friendly and developmentally appropriate assessments. The Pearson Clinical website gives a useful overview of the sections used at each level.

For both age bands, the test structure includes three levels of interpretation: Full scale; Primary Index scale; and Ancillary Index scale levels.

The updated Primary Index scales include:

  • Verbal Comprehension Index (VCI)
  • Visual Spatial Index (VSI)
  • Working Memory Index (WMI)
  • Fluid Reasoning Index (FRI)
  • Processing Speed Index (PSI).

The Ancillary Index scales include:

  • Vocabulary Acquisition Index (VAI)
  • Nonverbal Index (NVI)
  • General Ability Index (CAI)
  • Cognitive Proficiency Index (CPI).

Age range

Between 2 years, 6 months and 7 years, 7 months. Separate assessments are available for children up to four, and children over four years.

Who can use it?

This is a closed assessment and can only be administered by someone who is registered with the Health and Care Professionals Council (HCPC) as a practitioner psychologist and who is also a chartered psychologist with the British Psychological Society (BPS).

How is it used?

The WPPSI-IV is administered under strict guidelines by a restricted group of users and consists of subtests appropriate for each age group. It takes 30–45 minutes for the core subtests for ages 2 years, 6 months–3 years, 11 months and 45–60 minutes for ages 4–7 years, 7 months.


  • The assessments have been devised to be appropriate for young children and were updated using a normative sample standardised on 1,700 children in the USA.
  • Good reliability on the subtest and composite scores.
  • A good range of subtests.
  • Can be carried out over a reasonable time frame.


  • Standardised on USA population and therefore care to be taken with interpreting age norms.
  • Can only be used by restricted group.

Is there a cost?


Where can I get it?