This analytical method or structured research was developed by Prof. Fritz Zwicky of the Technical University of California. It describes the most important parameters and their variables of a problem and arranges them in a coordination system. In a problem that has 2 important performance parameters, the shape of the matrix would be a rectangle, with 3 parameters it would be a cube. Such a model is called a file box with drawers. Each drawer is filled with a variant of, say, the 3 parameters. Some of these drawers are quickly filled with existing concepts. A large number of drawers, however, are empty, often because no one has yet thought of combining the possible variants in this way.