1) Edward Thorndike's trial and error learning theory proposes that learning occurs through a process of testing different responses and retaining those that are successful.
2) In Thorndike's experiments with cats in puzzle boxes, the cats initially responded randomly but eventually learned to open the door by pulling a string, eliminating unsuccessful responses over time.
3) Thorndike identified factors in trial and error learning as motives, stimuli, responses, consequences, and fixation on successful responses. His laws of learning also addressed readiness, exercise, effect, use and disuse.