All participants medication adherence was measured by self-report, canister weighing, and with the Nebulizer Chronolog, a microprocessor-based monitor of inhaler adherence that recorded the date and time of each inhaler use. The subjects were assigned to one of three adherence treatment groups; a control condition, an informed condition, and a feedback condition. Adherence outcomes were analyzed with respect to treatment assignment, as well as CAMP measures of asthma morbidity, pulmonary function, medication side effects, psychosocial development, and quality of life. Cost-effectiveness analyses were also conducted.