Dieter: Let me add a few notes on How to teach in general.
First, you have to set goals for your teaching. Who's the audience? What are they expecting from the lectures? What do you intend to teach them? How to teach Go largely depends on whether your trainees are newbies, beginners, children, passers-by on a Games Exposition, or one single dedicated student.
Second, you have to explore the available resources. What material do you have/need? How frequently will you teach? How many auxiliary teachers will be present? What are the qualities of the teachers?
Third, you have to take the human nature into account. Attention span decreases with the number of people present and with time. People learn more by doing something than by showing it to them. The levels of understanding are: accepting, understanding and performing. Many lectures get stuck at the acceptance level.
Chris Hayashida: Having started playing go just over a year ago, and now teaching a beginner's class, I thought I'd share my thoughts, less on material, and more on style:
As for technique, I would say that these are the most important, after the basic rules:
Conversely, I think these can wait:
Bob McGuigan: A couple of observations. First, the famous Japanese pro and teacher Izumitani Masanori 7p advised that when teaching beginners explain as little as possible to get them able to play, then let them play and discover the rest of the rules and concepts for themselves. Ko and what it takes to keep a group from being captured, for example, are most easily discovered rather than taught. Next, the Japanese seem to feel that teaching beginners is a worthy activity even for strong professionals. Izumitani sensei gave a series classes for beginners on NHK television several years ago. At the 2004 U. S. Go Congress someone had the bright idea of having a series of newbie/beginner classes for spouses and companions of players. Who taught these classes? One of the strongest pros at the Congress (8p!). I have seen some of Izumitani's TV classes and watched Saijo-sensei teach beginners at the U. S. Congress, and I was struck by the enthusiasm and compassion these fine teachers demonstrated.
John Redford (7k): I occasionally teach a large class of complete beginners, and I've stopped playing my own moves. I now call another student over and ask if they will place my stones for me. I start by pointing to exactly where I want to play, but then back off and just say 'push', 'cut', 'extend', 'jump' and so on, I just make sure to gesture toward the section of the board where I want to play and trust them to find the move. I usually don't correct them if they don't play exactly where I want. I think that this technique (besides being lots of fun for all involved) gets the person placing the stones thinking about moves in a more systematic way.