According to Tim Gunn, the contracts which are signed by the designers upon qualifying for "Project Runway" clearly state that pattern-making books, fashion how-to books, fashion magazines, or other such materials are not allowed anywhere on the production. Designers are also not allowed to leave the production without being accompanied by a member of the production staff, to ensure that they do not gain even temporary access to such materials, outside assistance or suggestions, or materials for their challenge garments not acquired according to the challenge parameters.