Mobile health applications (mHealth apps) are an opportunity offered by developing technology which in widely used among youths. The evidence regarding mHealth apps suggests that the apps can be safer and more feasible if are developed by healthcare team. Healthcare professionals have a major role to play in developing mHealth apps of good interventions.

This study aims at developing the mHealth application (YoungAsthma) and evaluating the effectiveness of YoungAsthma app on the mean score of the asthma control test and self-efficacy scale in adolescents with asthma. This study is a self-efficacy theory-based, 4-week, randomized parallel group study. Participants will be randomized to either the intervention or control group in a 1:1 ratio. Adolescents will be randomly allocated to intervention (YoungAsthma which is a user-focused mHealth app) or control group (Usual care). The study protocol is conducted in accord with the Standard Protocol Items: Recommendations for Interventional Trials (SPIRIT 2013 Statement) (Chan et al., 2013), the RCT is perform by the Consolidated Standards of Reporting Trials (CONSORT) (Moher et al., 2010) and the mHealth app is identified according to the mERA guideline (Agarwal et al., 2016).

Inclusion Criteria:

• Having ability to speak, read and write Turkish at a sufficient level,
• Having a diagnosis of asthma for at least a year,
• Having an asthma control test score of 19 or below,
• Having ability to use mobile devices,
• Having a mobile device with an internet connection to login to the mHealth App.

Exclusion Criteria:

• Having an internet access problem,
• Having a psychiatric medical diagnosis

It has not been yet decided. After the study is finalized, the plan to share individual participant data will be done.