The Feeling of Satisfaction with Inhaler (FSI-10) is a self-completed questionnaire designed to assess the patient opinion regarding the satisfaction and usability of the inhalers irrespectively of the drug used. It consists of 10 question each with 5 possible responses on a 5-point Likert scale scored from 5 to 1, respectively. The total score can range between 10 and 50. The higher the score, the higher the feeling of patient satisfaction from the inhaler.