Didaction
April 29, 2009
By Rob Weir
Want your lecture to be more than a talker and an undifferentiated mass of bent-headed note-takers? Consider “didaction,” a mix of exposition and student action. Didaction is what public school teachers do as a survival mechanism — most of their charges simply can’t stay focused for 50 consecutive minutes of “chalk and talk.” Your undergraduates are products of those skilled teachers who integrate three or four separate activities into a single class. You can’t do as many activities in the roughly 2,400 semester minutes you’ll have with students — about 10 percent of a high school teacher’s contact minutes — but you can do plenty to involve students, even if you’re speaking before classes the size of a small rock concert. Among them:
2. Say it in pictures: PowerPoint is much maligned because it’s so poorly used. (Is there anything more boring or insulting than having someone read a slide to an audience?) It can, however, be a powerful tool if you use it like a combo overhead projector/slide projector. Show images and ask students to comment on them. Your “lecture” will consist mainly of summarizing the correct assumptions students extract from images, data, etc. Still images work much better in the classroom than video. Students often let moving images wash over them rather than drinking them in. Still images slow them down. Anytime you have data or geographic references, project them or don’t bother to mention them at all.
A variant is to have students listen to somebody who isn’t you. I like to use music. Recommendation: If you use music, and if it’s the lyric you want students to consider, either pass them out or project them. If there’s something in the music itself, cue students about what it is you want them to hear and when it’s coming. Ask for immediate feedback.
3. Be a story teller and solicit input: A skilled lecturer can turn information-giving into a story. I once heard an astronomer tell the story of the lifecycle of stars with such finesse that he could stop and ask listeners what would happen next. Most of the time the answers were right, but when they weren’t he went back to storytelling to explain the error.
4. Do a demonstration of the concept just explained: This has been a staple of good chemistry profs for years, but it works for most disciplines. Give the facts, properties, or sequence then set up a quick experiment or scenario that asks students to apply what they’ve just heard. It need not be complex. I once projected and explained the phases of the Chinese concept of dynastic cycles, gave a 10-minute capsule summary of the Qin Dynasty, then stopped the lecture and asked students to take one minute to scan their notes and label the dynastic cycle phases. Then I projected the Qin cycle that I prepared before class and asked them to compare it to what they had done.
A friend who teaches computer science tells his students that each will be responsible for writing one line of code at the end at the end of his explanation. He gives them a minute or two to compose the code then solicits one line at a time that he plugs into a program projected for all to see. He writes what he’s given even if he knows there’s a glitch and lets his students unravel the errors to see why it’s an error.
5. Do a two-minute scenario/role play: You can do this in lectures of hundreds of students. I’ve lectured on the tactics of Joseph McCarthy and asked students to consider what their options would have been. I walk away from the podium and wade into the crowd, Oprah-like. (That alone changes the mood!) I select a random student and ask McCarthy-like questions. When he or she answers — which invariably evokes nervous laughter — I walk up to another student and ask the same questions. Then I simply ask, “OK, so what realistic options would a person have if asked such questions?” This drives the lesson home faster and harder than I could do by reciting chapter and verse.










from Stacy Caplow, Clinic Director



Mind-boggling. We have the best jobs in the world (well, other than, maybe, the members of Bob Dylan's back-up band, and being an MLB bench coach). We teach, we write, we work with smart and interesting people, we have the capacity to stay forever young by being involved on a daily basis with those 25-40 years younger than we are. we're paid well and for those of us who are tenured, we basically can't be fired. I am agape at this...