for researchers


Wechsler NonVerbal Scale of Ability
The WNV is a test that was developed in 2006 by David Wechsler and Jack Naglieri. It can be used with children from 4 to 21 years of age. The WNV does not rely on children having to listen to instructions or respond verbally. It was specifically designed so that children who have difficulties using spoken English are not disadvantaged by not understanding instructions or knowing the words with which to respond. For this
reason, the test can be used with children who are not native speakers of English, children with language delay or disorder, and children with a hearing loss.

The test activities in the WNV are designed to examine children’s ability to remember visual information, solve problems and think abstractly. To complete the test, the children need to be able to pay attention and think quickly, as they have a limited time period in which to respond. Generally, it takes around 30-40 minutes to complete the test.

After a child has completed the test, the results are compared to those obtained from a large population of normally developing children of the same age. This gives an indication of each child’s skills compared to those of his or her peers.

The LOCHI study engages experienced psychologists to administer the test to children when they reach the age of 5 years. These assessments are provided to LOCHI study participants at no cost to parents, meaning that parents receive an assessment valued at over $300 for free.