1. Listen to the Question.
2. Understand the Question.
3. Think a minute before you answer. Sometimes how you say something is as important as what you say.
4. Answer the Question.
5. Shut Up. Don't feel the need to feel in any silences. Don't get what the author referred to as disc jockey syndrome--you don't need to fill in all of the dead air. Where people often get in trouble is when they go way beyond the scope of the question, and unnecessarily so. Only answer the question asked.
These are great rules and a great summary of a much longer deposition rule summary I blogged about earlier.