The report presents the results of a critical review on the relevance and reliability of data sources, methods, parameters and determining factors to produce market studies on manufactured nanomaterials in the EU. It serves as a basis for conducting and producing new studies on nanomaterials in the EU market. It begins with analysing the data sources, methods and parameters already used for such market studies, and identifies, proposes and analyses a further optimal combination of these data sources, methods, parameters and determining factors.