The International Style was introduced in 1932 at an exhibition at the Museum of Modern Art which contained the works of many Bauhaus architects such as Walter Gropius and Mies van der Rohe. The two men responsible for the exhibition, Henry-Russell Hitchcock and Phillip Johnson, wrote The International Style, which served as a catalogue for the exhibition. The title for the book had been taken from Gropius’s International Architecture, which had been published seven years earlier. In the forward to the book, Henry-Russell Hitchcock describes that they have not created a new style of architecture but instead only described the architecture of leaders such as LeCorbusier, Gropius, and Mies. International Style ideals Functionalism defines building as “science and not art”. It also discourages unnecessary additions to the design of buildings such as an ornamental design. The International Style encourages supporting a building with a strong steel frame rather than trying to support its weight in the walls. Advocates that flat roofs are much more successful than a slanted roof. Encourages using windows as the exterior walls of the building. Hitchcock and Johnson also believe that standards should be set pertaining to the design of buildings. They argue that the buildings which are most highly esteemed are those which are in their plainest forms.