This paper presents an in-house BAuA study on the evaluation of the COSHH essentials exposure predictive model. The different aspects of model evaluation as the internal and external validation and the operational analysis of the model are discussed. The external validation is based on measurement data obtained in the context of BAuA field studies performed in different industries: e.g. printing industry and textile industry. In addition, measurement data and information on industrial hygiene provided by the chemical industry within the framework of the Existing Substances Risk Assessment program are used. Although the evaluated exposure data cover a wide variety of activities and workplace scenarios, there is still a considerable lack of appropriate exposure data, especially for the more stringent control strategies. It was found that the level of agreement between the measurements for solid substances (powders, dusts) and the predicted ranges is reasonably good. The situation is in part different for liquids. In workplaces where organic solvents are used in litre quantities, exposure levels meet the predicted ranges or are often lower. For small-scale uses of liquids (ml-scale) e.g. in carpenters' workshops, there were indications that the exposure levels can exceed the predicted ranges. However it must be noted, that the data base is rather small.