This study began with an 8-week screening period during which participants were monitored while they used an inhaler with a low dose of ICS medication. During this time, participants also attended one or two study visits. At each visit, participants underwent a physical examination, exhaled nitric oxide analysis, and lung function and airway pressure testing. After enrollment criteria were met, participants underwent these same evaluations again, and they completed questionnaires to assess asthma control, quality of life, and home environmental factors. Blood was collected and a methacholine challenge test was completed, which artificially triggers an asthma attack to determine the severity of an individual's asthma. Participants then were randomly assigned to one of six treatment sequences, each of which includes the following three regimens in a different order: