Listen, let each witness speak freely, and be courteous and considerate. Take notes without distracting the witness. Use a tape recorder only with consent of the witness. Use sketches and diagrams to help the witness. Emphasize areas of direct observation.
Label hearsay accordingly.
Be sincere and do not argue with the witness. Record the exact words used by the witness to describe each observation. Word each question carefully and be sure the witness understands. Supply each witness with a copy of his or her statements. Signed statements are desirable.