Florence Knoll created the interior design service of Knoll Associates (The Knoll Planning Unit) in 1943 and directed its activities until 1965, the unit closed down 1971. The Planning Unit at first designed Knoll Showrooms, arranging furniture and accessories to showcase the firm's designs and demonstrate how to use the furniture, Knoll Showrooms became an essential part in convincing clients to adopt Knoll's modernist aesthetic. During the post-war period, the United States experienced an office building boom, and the Knoll Planning Unit was well positioned to take advantage as it began offering innovative full-service design solutions for office interiors including everything from space planning to furniture selection. Knoll also advanced the science of office design, not just decorating the space, but analyzing the client's work requirements and designing functional spaces that would meet these needs. Knoll conducted interviews to identify clients' work needs through interviews. The Unit completed over 70 office interiors, including the offices of major American companies such as IBM, GM, Look magazine, Seagram, Heinz, Connecticut General Life Insurance Company, and CBS. The Unit's breakthrough came from designing for the CBS president, Frank Stanton, who had been impressed by the Knoll Showrooms. Stanton promoted Knoll design to his contacts, and Knoll shrewdly promoted their work for CBS through architecture and design magazines. The Planning Unit typically ran on a very small team, typically only 8 designers and 2 drafters on staff, and even as the volume of projects dramatically increased, the staff only grew to around 20 employees. Knoll provided extensive education and mentoring to the designers that worked under her, and many of the Knoll Planning Unit designers went on to found interior divisions at architectural firms such as SOM. The preparation and training of interior designers earned the Planning Unit the moniker "Shu U" after Knoll's nickname.