The work of a Designer relies on many disciplines like environmental psychology, architecture, product design and traditional decoration. They plan the spaces of almost every type of building including hotels, corporate spaces, schools, hospitals, private residences, shopping malls, restaurants, theatres, and airport terminals. Designers for smaller firms usually work on a contract or per-job basis. One can also become a Self-employed Designer. Interior Designing is one of the few professions where one can operate from home with a minimal investment.