This review shows the relationship which exists between certain applicationsrelated and physical properties of dispersions. It also presents the possibilities at our disposal for determining such properties and influencing them in a desired manner. However, the available knowledge and methods are not sufficient for complete prediction of applications-related properties. Caps in our knowledge and in the experimental possibilities are indicated. What is feasible is demonstrated with the aid of some typical examples. The example are selected so that certain properties of the dispersions, such as particle size, rheological behaviour, or charge behaviour exert a pronounced influence on the applications-related properties. The examples cover various material systems, such as emulsions, polymer dispersions, dispersions of active principles, and inoganic pigments. In conclusion, the article considers what knowledge and methods will be required in the future for more purposeful product development.