Overall schematic of study. During the pre-incentive phase, of 1183 patients with evidence of problematic asthma control and were sent mailings containing the ACT, 25 returned the ACT. During the incentive phase, 87 patients out of 1612 patients returned the ACT. During the pre-incentive phase, 125 patients were eligible for telephone interviews, and during the incentive phase, 214 patients were eligible. The main reason for ineligibility was lack of an accurate phone number of address. A total of 95 telephone interviews were completed.