Instructional strategies acquire names, labels that describe what the strategy involves—active learning, problem-based learning, cooperative learning. Sometimes the strategies gain popularity. They become widely used, and so do the terms that describe them. After a while teachers stop describing what they are doing in class. They simply refer to it by the label: “Yes, I have students work in groups. I use cooperative learning.”The problem is that we think we're talking about the same thing, and we aren't, as is eloquently illustrated in the article referenced below