This document discusses intelligence and intelligence testing. It provides definitions of intelligence from several sources over time that emphasize abilities such as problem-solving, abstract thinking, learning, and adapting. It also describes different types of intelligence tests, including individual tests administered one-on-one and group tests. The document then focuses on the Bhatia Performance Tests of Intelligence, developed in India in 1955 to test intelligence in the local population. It describes the five sub-tests of this battery test and provides details on administration and scoring. Finally, it discusses intelligence quotient (IQ) and how scores are interpreted based on mental age and chronological age.