Part 1 Defining thinking: thinking as association of ideas, response to biological demands, adaption to the environment, cognitive restructuring of situations, resolving discrepancies. Part 2 Reasoning: insight learning - a chimpanzee insight; cognitive style - uses for a brick; human reasoning - processing negative statements, probabilistic reasoning. Part 3 Representation: concept formation; schemas; scripts; cognitive maps. Part 4 The development of representation: modes of representation - enactive representation, iconic representation, symbolic representation, representation and revision strategies; the development of schemata, the body schema, assimilation, accommodation. Part 5 Problem-solving: trial and error learning; learning sets; mental sets; lateral thinking; brainstorming. Part 6 Computer modelling: computer simulation; artificial intelligence - expert systems.