Description of the Ability to Learn How to Handle Inhaler Devices in Asthma

The main objective of this study is to describe the handling of inhaler devices (Diskus®, Turbuhaler® and Ellipta®) in patients with asthma. All participants will use each inhaler device (Diskus®, Turbuhaler® and Ellipta®) daily for one week: * Two puffs per day (Diskus® and Turbuhaler®), * One puff per day (Ellipta®). At each visit (day 1, 8, 15 and 22), patients will have a physical exam. For each inhaler device, 4 video recordings will be performed: * Video recording #1: Inhalation (one puff) without any instruction of use. * Video recording #2: Inhalation (one puff) after reading the patient information leaflet. * Video recording #3: Inhalation (one puff) after watching a standardized video demonstrating correct inhaler technique. * Video recording #4: inhalation (one puff) after seven days of daily use. The patient will be asked to fulfill a satisfaction survey about each inhaler device.