Thermodynamic calculations are used regularly by researchers at universities and in industry to reduce experimental work and to know the equilibrium state. The use of fast computers has supported the development of general software and databases. These fast computers have reached a mature state where almost any type of equilibrium or diagram can be calculated readily. However, the use of such general software, even if it is called “user friendly,” is too difficult except for specialists. There is a need for simplification. The new type of user interface is called an “engineering-oriented” user interface. Ideas for such an interface are discussed. It is based on the most modern hardware and software technology using UNIX and X-windows on modern workstations.