An evaluation of the software quality of EUSES 1.00 (European Union System for the Evaluation of Substances) was carried out. Quality criteria for software products for the risk assessment of chemicals were developed. They were derived from common standards (described in ISO/IEC 12119), publications, and newly established requirements. Thus, a compilation of quality criteria emerged which can serve as a basis for the development of further similar programmes. After testing the software and reviewing the documentation, EUSES presents itself as a modern product which basically fulfils the postulated quality criteria.Particularly with regard to correctness and stability, no errors were found. EUSES contains some innovative features. However,numerous alterations are necessary. High complexity, low modularity, and incomplete documentation result in a lack of transparency and are emphasised as major points of criticism.