The problem of attrition from mental health care programs before such services begin is poorly understood. The present research has identified several variables which predict first appointment cancellations for Oregon involuntary commitment petitioners in behalf of potential clients. The value of such variables is discussed in terms of petitioner attrition from involuntary commitment programs, mental health needs of those petitioning for the involuntary commitment of "allegedly mentally ill" persons, increased mental health program efficiency, and economic benefits for underbudgeted and understaffed mental health care programs. Recommendations to improve community mental health programs in general, and involuntary commitment programs in particular are presented.