The purpose of this study is to investigate the efficacy of inhaled ciclesonide at three different dose levels compared with placebo with respect to pulmonary function, asthma symptoms, and use of rescue medication in children aged 6-11 years with asthma. Treatment medication will be administered as follows: ciclesonide or placebo will be inhaled once daily in the evening. The study consists of a baseline period (2 to 4 weeks) and a treatment period (12 weeks). The study provides further data on safety and tolerability of ciclesonide.