Hi Jack: Better student centered activities might be quite diverse. For instance, you might begin with lab (covering previous day skill practice). Or some weaker students may need more time to grasp the technical theory, while stronger students may be able to take basic information and get into lab earlier than others. For me, student-centered means (in part) adjusting the curriculum to fit the individual needs of students. If the goal is for them to learn, sometimes we have go to where they are to make that happen. Regards, Barry