Introduction
Piaget's theory of cognitive development is a comprehensive theory about the nature and development of human intelligence, Santrock (2008). It focuses on mental activities in which a person engage in perception, categorization, understanding, inference drawing, logical reasoning, problem solving, imagination, memory, decision making and intuition, Wittrock&Lumsdaine (1977).
Task
This theory was pioneered by Swiss developmental psychologist Jean Piaget 1896–1980. Piaget observed and a described child at different ages, His theory is very broad, from birth through adolescence, and includes concepts of language, scientific reasoning, moral development, and memory. To test Intelligence Binet (1904) and later Binet and Simon (1908), devised a scale that consisted of thirty tasks of increasing complexity.