Initially, we adapted the model of shared decision-making that has been used successfully in cancer to make it appropriate for a chronic disease (asthma). We will also adapted the KP Asthma Guidelines so that the two models (Management by Guidelines and Shared Decision-Making) take a similar amount of clinician-patient interaction time. We are comparing the two models and usual care in the primary care setting at Kaiser Permanente Northwest and Kaiser Permanente Hawaii in a randomized controlled trial with 24-month follow up. The individual asthma patient will be the unit of randomization.