Simple, validated eczema severity scores are required for the evaluation of interventions. The Rajka & Langeland (R&L) scale is based on 3 domains (extent, course, and intensity); however, its validity is not yet confirmed. The aim of this study was to investigate the quality aspects of the R&L scale in clinical practice. In the first part of the study, experts and consumers judged the content validity of the scale. The second part of the study was performed with 87 children during a 4-month eczema school. Construct validity, internal consistency, sensitivity to change, time consumption and health-related quality of life variables were investigated. The content of the R&L scale was considered valid by 45 panellists. Inter- and intra-observer reliability was very good. Divergent construct validity was adequate, while convergent construct validity and internal consistency were inadequate. The R&L scale was able to define a significant improvement in eczema during the eczema school. The time required for completing the R&L assessment was significantly shorter than for objective Severity Scoring of Atopic Dermatitis (SCORAD). The R&L scale is a simple, fast, valid, reliable and sensitive tool for scoring of atopic dermatitis in everyday clinical practice.