Classification of Intelligence according to Thorndike Types of Intelligence Thorndike has classified intelligence into 3 categories namely 1. Abstract Intelligence It is the ability to understand words, numbers and letters and to use them effectively abstract intelligence is required in ordinary academic subjects in schools such as reading, writing a solving academic problems. The highest level of abstract intelligence is manifested in the thoughts of poets, philosophers and writers. 2. Social Intelligence It is the ability of an individual to deal effectively and efficiently with his social and cultural environment. Social intelligence is revealed when a person is able to establish and develop desirable social relations in conformity with his social and cultural norms. 3. Concrete Intelligence It is the ability to understand and d..