The ICAT group was formed mostly by architects born in the 1910s and early 1920s, who represented the second generation of Portuguese modern architects, and whose main aims were to promote the rationalisation of construction systems and their architectonic expression. Although there is no known group manifesto, where its collective aims or the methods intended to achieve them are stated, over the course of about a decade this group maintained important collaborative activity among its members, manifested mostly in three main events – its presence in the EGAP exhibitions between 1946 and 1956, its participation in the First National Congress of Architecture in 1948, and the publication of the magazine Arquitectura, between 1947 and 1956.