How to start a lecture and how to end one
Start a lecture by stating the claim of the hour and why it matters to the people in the room, within the first three minutes and before any administration; end it by saying the claim again with the evidence now behind it, naming what students can now do, and giving the reading, with questions taken before the close rather than after. The opening buys attention; the close decides what is remembered.
This guide gives the first three minutes and the last five as scripts you can adapt, the slides that go with them, and the things that go wrong at each end.
The first three minutes
The room is settling; whatever you say first is heard by half of it. So:
- Start on time, with the slide already up. The title slide says the week and the topic; nobody needs to ask.
- One sentence of where we are. "Last week we saw that context switches cost; today we decide who runs next."
- The claim. "By the end of this hour you will be able to compute waiting time under three policies and say when each one wins." Said, and on a slide.
- Why it matters to them. A problem they have met: the lab machine that stalls, the exam question, the interview. One sentence.
- The map. The blocks of the hour and what they will do in each.
Then start block one with its question. Administrative notices go at the end of block one, when the room is full.
What to skip: a joke (it either lands or costs a minute), a long recap (one sentence), "how was your weekend", and reading the agenda slide aloud item by item.
Alternative openings that work
- A question they cannot yet answer, on the slide, left open: "Three processes, quantum 4: who waits longest?" Answered in block two.
- A wrong answer: last term's most common exam mistake, shown, with "by the end you will see why this is wrong".
- A result before its explanation: a figure from the reading, with "this is what we are explaining".
- A short story from the field, one minute, only if it leads directly to the claim.
Each puts the claim in the room by minute three.
The last five minutes
- Stop content at minute 50 (of 60). If the last block is unfinished, cut it and say so: "the second example goes to the problem set."
- Take questions now, not after the close.
- The claim again, with what is now behind it. "So: waiting time depends on the policy; SJF is optimal if you can predict, RR trades throughput for response, and the quantum is the knob."
- What you can now do. One sentence in the second person.
- The reading, the task, the handout. On a slide, with dates.
- The question for next week. "What happens when a process changes its behaviour halfway?" Then stop.
The last thing said is the claim or the question, not "thanks" and not "any questions?".
The closing slide
Not "Thank you" alone. A closing slide carries the three things students photograph: the claim in one line, the reading with sections, and the task with its date. Contact lines go at the bottom in small type. The lecture template ends with such a slide.
Mistakes at each end
Start. Administration first; a recap that becomes a second lecture; apologising for the slides; starting without the projector working (test it before the room fills).
End. Running over: the close is the first casualty and the most expensive one. Ending on questions that trail off. A summary that introduces new material. Reading the references slide aloud.
Planning the two ends
Put them in the instructor guide as fixed text: the claim sentence, the opening question, the closing sentence, the reading line. They change little between terms, and having them written means the hour starts and ends the same way even on a bad day. In Lecture Studio, the unit's Week guide starter writes the guide from the deck and the readings; the deck's speaker notes carry the opening and closing lines on the slides where they are said.
FAQ
How do I start a lecture?
State the claim of the hour and why it matters to the room within three minutes, then give the map of the blocks. Administrative notices come later.
How do I end a lecture?
Stop content ten minutes early, take questions, restate the claim with its evidence, say what students can now do, give the reading and task, and finish on a question for next week.
Should I start a lecture with a joke?
Only if it leads to the claim. An open question or a wrong answer from a past exam does the same job with less risk.
What should be on the last slide of a lecture?
The claim in one line, the reading with sections, the task with its date; contact details small at the bottom. Not just "Thank you".