“I have to teach someone to make a peanut butter and jelly sandwich. How am I supposed to do that? What should I start with? How can this be so hard?” I have found that teaching anything to another person is rife with far more decisions and dilemmas than I could have ever imagined at first. Years ago, I had a college roommate who wanted to participate in a summer teaching program. For her interview, she had to develop a lesson plan to teach someone else how to make a peanut butter and jelly sandwich. Have you ever thought about teaching someone else how to make a peanut butter and jelly sandwich? She had asked for my input, and once we started to really consider the possibilities, our minds reeled. How would you start? What would you do first? Next? After that? Who was the learner anyway? And had they made a sandwich before? Were they allergic to peanuts? How old were they? Should we let them have a knife? Should we show them how first? Talk them through it? Let them have a go at it on their own? Should we first teach them the names of all the tools and things we were going to use? Should we ask them why they needed to learn how to make a peanut butter and jelly sandwich in the first place? What were the critical issues in teaching someone how to make a peanut butter and jelly sandwich? Much like in the “PBJ Dilemma” as we came to call it, there are many decisions to be made in designing effective learning experiences in undergraduate biology classes—and instructors are making these decisions constantly. It can seem overwhelming, yet the research literatures from cognitive science, psychology, and science education about how people learn suggest guidelines about constructing effective learning experiences (National Research Council [NRC], 1999 ). Much like the PBJ Dilemma, the order in which we decide to do things with students when we teach is critical, yet the order of things happening in a class session often goes undiscussed and unexamined. At first glance, the most pressing teaching dilemmas in our biology classrooms—student motivation, student retention of information, student understanding of difficult concepts—may seem unrelated to the order in which things are happening; however, what we do first, second, third, and so on can have many ramifications. For many instructors who have primarily learned from and used a lecture-based teaching approach, considerations of order have been primarily about the order of ideas. With the increasing use of active-learning strategies, class sessions are moving from having a single component—a lecture—to having many components over the course of even 50 minutes (e.g., a video clip, a pair discussion on a biology-based problem, a clicker question, a mini-lecture, and a final index card reflection). So, what is the optimal order for sequencing these elements to maximize student learning of biology?
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