The elaboration of complex fluids whith special properties and functionality is based on formulation engineering, a multi-level science, encompassing process engineering, physico-chemistry, chemistry, rheology and interface sciences among others. Some objectives of formulation engineering are the quantitative analysis of the different steps of the manufacturing process, the mastering of those steps in order to relate to formulations established in the factory laboratory, the knowledge and monitoring of the rheology of the complex fluids in the course of its formulation.