['Patient decision aids (PDAs) are used in shared decision making to improve practitioner-patient communication and help patients decide about treatment options. To develop a PDA for adults with asthma considering inhaled corticosteroids, with or without long-acting beta2-agonists, to optimize asthma control.', 'The PDA was developed based on the International Patient Decision Aid Standards. Step 1: PDA was drafted. Step 2: PDA acceptability was assessed among target users, certified asthma educators (CAEs) and adults with asthma, following an iterative process. a) Participants read the PDA, b) rated its presentation, length, balance, and perceived usefulness, indicated what they liked/disliked about it, and made suggestions for improvement. c) Based on results from (b), PDA was refined. This process was repeated with new participants until no suggestions were made. Step 3: The PDA was field tested with target users. Interviews with CAEs were conducted to identify areas of improvement. Step 4: Final PDA version was written.', 'A color-printed, 4-page, letter-sized PDA was drafted. Acceptability testing involved 11 CAEs (women, n = 10) and 20 adults with asthma (women, n = 13; age 22-61\xa0years). Five successive refined versions were produced. Major changes were made to PDA terminology, instructions, paper size, and visual presentation. Two CAEs (women, n = 2) and 26 adults with asthma (women, n = 19; age 20-65\xa0years) field tested PDA. Minor changes were made to language and instructions to ensure usability. The final version was a color-printed, 12-page, A3-sized booklet.'] Do development of a patient decision aid on inhaled corticosteroids use for adults with asthma?