CertiCon has developed a software framework for the semi-automatic classification of biosignals, optimised for the analysis of sleep data. The system is hardware independent and enables the implementation of an interface for the reception of various signals from various types of devices. The features essential for the automatic classification of individual segments of records in the hierarchically-arranged tree clusters are extracted from the input signals using advanced methods. The system then performs the classification of the sampled data in the tree structure of hierarchically-arranged classes (clusters) and offers experts key parts of the record recommended for evaluation.