At Wageningen UR Research on end product quality is bipartite. On the one hand studies are performed to obtain clear insight in necessary product requirements based on converting processes and consumer demands. On the other hand research is performed on enhancing the performance of end products by specific coatings, changes in fibre raw materials, new functional chemicals or appropriate process control. An example of a project in this theme is ‘Optimisation of Stiffness’, which is performed in co-operation with the Dutch Competence Centre Paper and Board, paper and board producers, their customers and suppliers of chemicals and paper analysis equipment. The objective of this project is a better control of stiffness of the paper or board product.