Identifying, acquiring, and developing valid and reliable instruments are major problems facing researchers who study psychosocial drug use and abuse. Much time is often devoted to creating a measuring device when an adequate one already exists, resulting in duplication of effort, considerable waste of resources, and loss of uniform comparability…

A study of WISC-R and the Slosson Intelligence Test (SIT) reveal that SIT IQs were higher than WISC-R IQs in the upper range and lower in the lower range. Concludes that the SIT provides a good estimate of WISC-R full scale IQs when a regression equation is used. (Author)