Introduction. Since 2008, GINA recommends the assessment of the degree of asthma control in the follow-up of bronchial asthma patients by means, among other tools, of Asthma Control Test (ACT). Aim. The aim of the study was to investigate the usage of ACT among asthmatic children treated in Warsaw outpatient clinics and to assess the opinion of physicians and patients about the usefulness of the ACT in achieving satisfactory asthma control. Materials and methods. A questionnaire survey was performed among the patients of the outpatient clinic at the University Hospital and allergists from Warsaw. Results. The survey was conducted in a group of 48 patients with bronchial asthma at the age of 5-17, and in a group of 22 allergists. Seventy per cent of the patients have been surveyed using ACT for the first time during our study. In a 100-point scale, the usefulness of the test was rated at 59.9 points by patients and 54.3 points by physicians. The educational aspect of the study was appreciated by patients as the most valuable. Allergists appreciated most the fact that ACT improved cooperation with the patient. Although 90% of the patients assessed the test as understandable, physicians pointed out to the difficulty in understanding the questionnaire as the major obstacle in ACT usage. There was no correlation between the frequency of ACT usage and the assessment of its usefulness by the patients. Conclusions. Results of the study show that ACT is not commonly used in Warsaw outpatient clinics for asthmatic children. However, it seems that due to its valuable educational aspect and a role in improving cooperation between patients and physicians, the usage of ACT in the asthmatic children should be encouraged. [ABSTRACT FROM AUTHOR]