Jean Piaget's theory describes cognitive development as a progression through four distinct stages, where children's thinking becomes progressively more advanced and nuanced. In the first stage, known as the sensorimotor stage, which lasts from birth to around two years, children learn through their senses and actions, developing key concepts like object permanence, the understanding that objects continue to exist even when they can’t be seen. Next, in the preoperational stage, from ages tw...| Simply Psychology
Concurrent validity measures the extent to which a measurement is confirmed by a related measurement. It is a type of criterion-related validity that compares the test results to observations or measurements from other tests, surveys, or assessments| Simply Psychology
Discriminant validity, also known as divergent validity, is the extent to which a measure does not correlate strongly with measures of different, unrelated constructs.| Simply Psychology