Behaviorism was first introduced during the early 20th-century. It was a dramatic change to psychology being that it was a major change of perspectives not emphasizing on the conscious or the unconscious mind. In contrast with the other psychological methods, behaviorism focuses only on observable behavior. It's based on the belief that behaviors can be measured, trained, and changed. Behaviorists believe a persons enviornment determines their behavior, that our responses to environmental stimuli shapes our behaviors. Some strengths of behaviorism is that it is easier to collect data on studies done because it’s based on observable behavior. Although behaviorism isn’t as popular today like it was in the mid 20’s many of its techniques are still being used till this day.
"Psychology as the behaviorist views it is a purely objective experimental branch of natural science. Its theoretical goal is the prediction and control of behavior. Introspection forms no essential part of its methods, nor is the scientific value of its data dependent upon the readiness with which they lend themselves to interpretation in terms of consciousness,"--John Watson, 1913