Objective. To identify criteria whereby triability can be determined. Design. Questionnaire survey, The final rating was decided on the basis of a structured psychiatric interview. Setting. Oranje Hospital, Bloemfontein. Participants. A total of 736 questionnaires was sent to 176 judges of the Supreme Court, 480 magistrates and 32 attorneys-general and state advocates in South Africa and Namibia, and 33 psychiatrists and 15 clinical psychologists working in forensic psychiatric units in South Africa. With the information from the completed questionnaires, rating criteria were compiled, The rating criteria were applied by means of a structured interview to inn persons referred in terms of section 77(1) of the Criminal Procedure Act 51 of 1977. A multiprofessional psychiatric team was requested to evaluate the same 100 observandi independently. Results, A total of 298 (40.5%) of the questionnaires were returned. From the data of the completed questionnaires, 19 legal items, 17 psychiatric items, 2 special laboratory tests and 2 psychosocial items were identified as the most important and clear diagnostic indications for the evaluation of triability, The similarity between the findings of the researchers and those of the multiprofessional psychiatric team was meaningful to 1% of significance. For the proper application of the criteria a cut-off point of 31 was determined, A score of 31 or higher therefore indicates that a patient is unfit to stand trial, while a score of less than 31 indicates triability. Conclusions. The application of the proposed final rating criteria as a single method of rating is at the very least just as reliable as the multiprofessional team in evaluating fitness to stand trial. The proposed criteria, used as a single rating instrument, are cost-effective in terms of time and staff, avoid unnecessary hospitalisation and ensure that mentally ill accused will have a fair trial.