Acceptance into the program requires a team of four fliers (and any number of ground crew) and is done through the writing and submission (during late Fall) of a technical proposal which details among other things what the experiment is about, safety considerations, and outreach plans. In the 2007 campaign, 36 of the 74 proposals submitted were accepted. Upon acceptance, a flight date is assigned and the team must design and build the planned experiment by then. Prior to flight, submission of a TEDP (an in-depth description of apparatus) is also required, as are FAA approved physical examinations for all fliers and the optional alternate flier.