The majority of asthma patients are not well controlled, despite the availability of asthma medication that could effectively treat the disease. In this study uncontrolled patients who are steroid-naive or on low dose inhaled corticosteroids will be treated with Seretide (salmeterol/fluticasone combination, SFC) 50/250 µg twice daily. The asthma control test (ACT) will be used to detect differences in the level of asthma control during treatment. The study aims to show a correlation between improvements of ACT und the level of asthma control which will be reached by the patients.