Participant recruitment Practices will use the Minimal Asthma Assessment Tool (MAAT), which interrogates routinely collected data on their computer database, using patterns of medication usage, symptom control and biometric data to identify patients (12 years and over) with poorly controlled asthma.3 Potential eligibility will be confirmed by inspection of manual/computer records checking (and documenting) exclusion criteria: other significant lung disease, under specialist care for severe/difficult asthma, unable to communicate in English or use a mobile phone and at the request of the GP for other significant social/clinical problems. The practice will invite all potentially eligible patients by post to participate.