When taking the oath, hold your right arm up high with fingers straight and look at the officer administering the oath.
When the officer finishes the oath, “…so help you God”, you say “I do” in a loud voice so that all in the courtroom can hear.
Think before you speak.
Wait until the entire question is asked before answering.
On cross-examination, do not look at your attorney.
Speak up so that the judge, jury, counsel, stenographer, and others can hear you.
Do not memorize any of your testimony.
Answer the questions honestly. Be fair and frank. Do not be too anxious to please or too eager to fight.
Be brief. Just answer the questions and stop.
Do not volunteer information.
If you do not know or cannot remember, say so. Those are legitimate answers to the most illegitimate questions.
If you cannot answer “yes or no”, say so. Modify your reply by “under certain circumstances…”
When one of the lawyers calls “objection” or if the court interrupts, stop your answer immediately and wait until the court gives its ruling.
If you make a mistake, or a slight contradiction, admit it and correct it. Do not tie yourself in knots trying to cover up some slip of speech or memory.
Avoid mannerisms of speech. The habit of prefacing your replies with something like “I can truthfully say…” may cast unwarranted doubts on your whole testimony.
Keep your temper. Do not let anyone rile you into arguments over trivial points or even important ones. Be firm, but flexible.
Do not get caught in snares like this: “Did you ever discuss this with anyone?” Of course you did, and if asked, name those individuals with whom you discussed the case.
Never try to be a “smart” witness. If a lawyer is obviously giving you a chance for a wisecrack, avoid it like the plague. It is just the anesthetic before the knife.
If the opposing attorney interrupts you before you have a chance to complete your answer, you indicate this to the presiding judge.
When addressing the court, use “your honor”; when addressing the attorneys, use their names.
Never nod your head to indicate “yes” or “no”.
Keep your hands away from your mouth or face.
Do not chew gum.
At the conclusion of your testimony, ask if you may be excused; then leave the courtroom immediately.
During the recess you should not carry on any conversation with other witnesses or parties to the controversy. You should stand aloof from everyone except the attorney who retains you to testify.