Tests were made of the differences in the chronic and acute sympathetic-adrenal responses, as assessed by platelet and plasma catecholamines, pupil size, heart rate, and blood pressure, among married couples having different combinations of Structured Interview global and component Type A classifications. The five year marital stability and health of these couples were followed. A comparison was made of one week test-retest reliability with the five year stability of the Structured Interview global and component Type A measures.