Drever and Collins Performance Tests of Intelligence: A series of non-linguistic tests for deaf and normal children; devised by James Drever and Mary Collins in 1928 and used by Aberdeen City Council Psychological Service; made in Edinburgh.

Wooden case containing Drever and Collins Performance Tests of Intelligence; a series of non-linguistic tests devised by the psychologists James Drever and Mary Collins in 1928. They were designed to test the intelligence of both deaf children and those with full hearing. This set was made in Edinburgh and used by Aberdeen City Council Psychological Service.