Pink or white? asthma inhaler color may influence symptom perception

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Subject's and/or subject legal representative's written informed consent obtained prior to any study related procedure. * Age: ≥18 and ≤75 years of age. * Established diagnosis of permanent asthma for at least 6 months prior to screening/randomisation visit * Subject on maintenance therapy treated by Foster® (CHF1535 100/6 µg pMDI) for at least 6 months prior to screening/randomisation visit * Asthma Control Test (ACT) ≥ 20 at screening/randomisation visit. * Subject must have a cooperative attitude and the ability to be trained to use correctly the diary and answer the Visual Analogue Scale (VAS) * Subject willing and able to download the application on their personal electronic device to fill in the study e-diary. * Female subject of non-childbearing potential defined as physiologically incapable of becoming pregnant or female subject + male Partner must be willing to use a highly effective birth control method from the signature of the informed consent and until Visit 4 Exclusion Criteria: * Pregnant or lactating woman * History of 'at risk' asthma * Recent exacerbation * Non-permanent asthma * Asthma requiring more than 1 inhaler for maintenance treatment and more than 1 inhaler for reliever treatment. * Asthma requiring use of biologics * Respiratory disorders * Lower tract respiratory infection * Current smoker or ex-smoker with a smoking current use/history of ≥ 10 pack-years * Cardiovascular diseases * Subject with historical or current evidence of uncontrolled concurrent disease such as but not limited to hyperthyroidism, diabetes mellitus or other endocrine disease, haematological disease and autoimmune disorders * Alcohol/drug abuse * Participation in an investigational trial within the last 30 days (60 days for biologics) or a more appropriate time as determined by the Investigator * Contra-indications to Foster® constituted an exclusion criterion * History of hypersensitivity to Foster® or any of its components or a history of any other allergy that in the opinion of the Investigator contra-indicated the subject's participation * Subject mentally or legally incapacitated or subject accommodated in an establishment as a result of an official or judicial order * Blind, colour-blind subject or any other dyschromatopsia * Known psychiatric disorders that may have interfered with successful completion of this protocol according to the Investigator's judgment including schizophrenia, bipolar disorders and psychoses.