The aim of this study is to investigate the potential benefit of Pictorial versus Written Asthma Action Plans (AAPs) to support asthma management among young people with persistent asthma. Participants will be randomly allocated to the Pictorial or Written AAP group and followed up over a 6-month period. Qualitative and quantitative data will be collected from young people, parents and clinical teams involved in recruitment to assess the feasibility and acceptability of the Pictorial AAP (PAAP) software developed for this study, the PAAPs produced by the software, and the study procedures.