Computer Laboratory

Course pages 2013–14

Presentations

Videos of the lectures

You can view the 2012 versions of the lectures:
How NOT to give a presentation (18 minutes, University of Cambridge Streaming Media Service) or How NOT to give a presentation (Vimeo)
Presenting a paper (12 minutes). A short presentation of basic concepts and mis-conceptions in presenting a paper. This is an introduction to the longer presentations later in the course.

The 2009 lectures

Compare the 2012 lectures with the two lectures on presenations given in 2009.

You can view the 2009 versions either on the University of Cambridge streaming media service:
Good and bad presentationsHow to prepare a presentation
or on Vimeo:
Good and bad presentationsHow to prepare a presentation

Resources

  • Presentation Zen — Garr Reynolds approach to great presentations
  • Made to Stick — Dan & Chip Heath's explanation of why some ideas survive and others die

Brief summaries from the lectures

The basic talk

  • Who? — title, author, venue, date
  • What? — the key idea
  • Why? — why it is important
  • How? — technical details (if there is time - cannot do this in a five minute talk)
  • Where? — where it leads next
  • Final slide: — the key idea (leave this up during Q&A)

The right questions to ask

from Presentation Zen, Garr Reynolds

  • How much time do I have?
  • What is the venue like?
  • What time of day?
  • Who are the audience?
  • What is their background?
  • What do they expect of me?
  • What do I want them to do?
  • What is the fundamental purpose of my talk?
  • What is the story?
  • What is my absolutely central point?

SUCCESS criteria

from Made to Stick, Dan & Chip Heath, interpreted for Computer Science presentations by Neil Dodgson

  • Simplicity
    • not simplistic; not dumbed down
    • What is your key point?
    • What is your core message?
    • Why should your audience care?
  • Unexpectedness
    • Stimulate the audience's curiosity
    • Pose questions
    • Expose a gap in their knowledge - then fill the gap
    • Take the audience on a journey
  • Concreteness
    • Start with an example
    • Use examples throughout
    • Speak of concrete things, not of vague generalities
    • The abstract is hard to grasp, examples are easy to grasp
  • Credibility
    • Provide evidence that your idea works
    • For example: show results, describe the algorithm
    • Provide enough detail to make them go read your paper, but not so much that you bore them or lose them
  • Emotions
    • People are emotional beings: make them feel something
    • Catch their interest: can they use your work? do they believe you?
  • Stories
    • People love stories
    • Where appropriate, make the whole talk into a story
    • Use anecdotes in your talk: "When we started this research we assumed X, but we were surprised when we found that..."

Neil Dodgson's hints & tips

  • A research presentation is not a paper
    • You are presenting the idea that is in your paper
    • You are presenting an advertisement for your paper
    • You are convicing people to go read your paper
  • Beware the curse of knowledge
    • ...where you cannot imagine what it is like not to have your level of background knowledge on the topic. [Chip & Dan Heath]
    • Imagine the typical audience member (e.g., a member of your research group who does not know your work) and plan the talk to be accessible to them.
    • Try applying the Heath brother's SUCCESS criteria to your talk.
  • Start well
    • Start with the key idea
    • Start by catching the audience's interest - how did they do that? is that possible?
    • You have only two minutes before many of the audience will drift off - do not waste those two minutes
    • Ensure that you know exactly what you are going to say to start and have rehearsed it
  • Stop within the time limit
    • Using more than your time is rude and shows poor planning
    • If you run over time, everyone will remember that fact and not your talk
    • Do not try to cover everything that is in your paper - leave people wanting to know more - they'll go read your paper
  • Rehearse
    • Practice, practice, practice
    • A presentation is a performance - you would not go watch a stage show where the actors had not rehearsed - your audience have given up their own time to listen to you - you owe it to your audience to rehearse beforehand
    • Only by rehearsal can you ensure (a) that you start well and (b) that you will end on time
  • Check the technology beforehand
    • All lecture theatres are different.
    • Arrive at least ten minutes early to ensure that the technology works.
    • Ensure that you have a back-up plan if your laptop doesn't connect or if the software is unavailable or incompatible. For example:
      • If you take your own laptop, have a backup presentation on a memory stick.
      • If you use Keynote or Powerpoint, have a backup presentation in PDF.
      • Your luggage may go missing: put a copy of your presentation in The Cloud.
      • If you need an internet connection for your presentation, have a backup version that doesn't depend on an internet conection.
      • If you use video in your presentation, have a backup version that doesn't depend on video.
      • If you use sound in your presentation, have a backup version that doesn't depend on sound.

Lessons from The Gettysburg Address

I use the Gettysburg address as an example presentation. The course is about how to give good research presentations, so it may seem curious that I use a political speech from the 19th century as an example. However, I find that this speech has much to teach us.

Peter Norvig
My original reason for choosing the Gettysburg address was that Peter Norvig had produced a Powerpoint presentation of it. His set of slides demonstrates how a presentation tool can turn a good speech into a poor presentation; this was the key teaching point in the first year I used it. The Gettysburg address is sufficiently short (two minutes) that it is easy to give twice in a lecture: once without visual aids and once with the Powerpoint slides. A video of the first time I lectured this (2009) is available online.

Reflections on the Gettysburg address
My subsequent investigation into the history of Abraham Lincoln's address provided a range of other lessons for students preparing for a life of giving technical presentations. The Gettysburg address was commissioned as a short speech dedicating a military cemetery in Gettysburg, Pennsylvania. It was almost the final act in a three hour-long ceremony of dedication, which included music, prayers, and a two-hour long speech by Edward Everett, one of the great orators of the day. President Lincoln was invited to give the dedication a mere two or three weeks beforehand and his brief was simply to dedicate the cemetery "by a few appropriate remarks". He did rather more than this. What follows are the lessons that I use in my Research Skills class.

You don't need Powerpoint
or Keynote or LaTeX or any other slide software
It is quite possible to give a riveting talk without any visual aids. Norvig's slides clearly detract from the message. If you do choose to use visual aids then ensure that they add to your talk rather than detract from it.

You need to plan
Lincoln did not speak off the cuff. He planned the speech carefully. There are five or six drafts of the speech, most prepared in Washington before Lincoln travelled to Pennsylvania. He worked hard on this speech, ensuring that it said exactly what he wanted to say. You also need to plan when you are invited to speak.

You need to rehearse
You cannot deliver a talk well without rehearsal. In order to get the phrasing and timing right for delivering the Gettysburg address, I have to rehearse it three or four times beforehand each time I give this lecture. Likewise, when I am preparing research talks, I will generally run through my talk a couple of times the evening beforehand, to ensure that I am clear in my own mind what I am going to say.

You should grab opportunities to speak
Lincoln was invited only to give a two-minute dedication speech. He could, conceivably, have refused. But he grabbed the opportunity to address a crowd of 15,000 people, which included six state governors and many others who had influence in American society. We researchers should, similarly, be ready to grab any opportunity to present our work to our colleagues.

You should work within the constraints given you
Lincoln was asked to give "a few appropriate remarks". He knew that this meant he had only two or three minutes. He did not rail against this and write to the organisers asking that he be allowed to speak for longer. He worked within the constraints he was given to do the best he could. Likewise, if you are asked to prepare a fifteen minute presentation, do not prepare a thirty minute presentation and hope that the organisers will accommodate you. They won't. Work within the constraints you are given to do the best you

You should say what you need to say
Lincoln certainly did not restrict himself to "a few appropriate remarks". He made a political speech that inspired his audience. The construction of his speech is clever. The first five sentences are exactly the sorts of things you would expect a president to say when dedicating a military cemetery. His sixth sentence must have come as a shock to his audience. Lincoln says "But, in a larger sense, we can not dedicate, we can not consecrate, we can not hallow this ground." One can imagine members of the audience thinking "What does he mean by that? What is he talking about? Why can we not dedicate this ground?" Lincoln then goes on, in only four sentences, to inspire his audience to re-dedicate themselves to the cause of freedom. He does what he is asked to do, to dedicate the cemetery, and then goes on to say so much more: to say what needs to be said.

You can interpret your brief imaginatively
Lincoln did not restrict himself to dedicating the cemetery, he interpreted his brief imaginatively and gave a short speech that is remembered 150 years later. Likewise, when asked to give a research presentation, be imaginative in how you interpret your instructions. For example, when asked to give a talk about a research paper you may think that your job is to present your research paper. It is not. It is to present the key idea in your research paper. You may find that the best way to do this is to talk about some things that do not appear in your paper and to avoid talking about some other things that are in your paper. Be imaginative in getting your message across.

You must get your message across
Lincoln concentrated on getting his key message across to his audience. It is challenging to prepare a two minute presentation, but at least Lincoln knew that, in two minutes, he had time to convey only one key idea. In a research talk, it is all too easy to try to convey many different ideas and thereby confuse your audience. When preparing a talk decide what your key message is and ensure that that message is communicated clearly to the audience.