Guidelines are presented for school psychologists in order to make their testimony at special education due process hearings as effective as possible. Recommendations are offered to prepare the school psychologist to: (1) accept the role of expert witness; (2) organize and review case materials; (3) state relevant rules, procedures, and criteria; (4) review testing procedures and conclusions and be prepared for cross-examination; (5) interact with school board attorneys in the development of testimony; (6) testify calmly, professionally, clearly, and without jargon; and (7) use sound psychological techniques which will stand up to scrutiny. The guidelines are illustrated with excerpts from courtroom transcripts which demonstrate both desirable and undesirable behaviors. The conclusion lists seven guidelines to be followed in day-to-day practice so that the school psychologist will be prepared in advance if a case is brought to a due process hearing. (DC)