Answer: (1) Piaget believes that cognitive development is a process of construction, which is realized through the interaction between individuals and the environment. He put forward the stage theory of cognitive development, which divides individual cognitive development into perceptual movement stage (0-2 years old), pre-operation stage (2-7 years old) and specific operation stage (7 years old? 1 1 year), the formal operation stage (1 1 year to adulthood).

(2) Piaget's theory of stages of cognitive development has important implications for education and teaching. First, design courses according to the order of cognitive development. Second, teachers should arrange the teaching content to improve the teaching level slightly higher than the students' existing thinking level. Third, keep students' initiative and autonomy in learning and let them actively participate in learning activities. Fourth, attach importance to the role of social interaction in children's cognitive development. Fifth, there are individual differences in children's cognitive development, so we should teach students in accordance with their aptitude.