the invention relates to a circuit package comprising a module and a socket which cooperate to provide quick and easy insertion of the module into the socket using a small insertion force , accurate alignment between the module and the socket after insertion , and coupling between a module coupling site and a socket coupling site after insertion . a socket guide feature allows an edge of the module to slide along the guide feature during insertion of the module into the socket , and a module alignment feature interlocks with a socket alignment feature after insertion of the module into the socket . in addition , after insertion of the module into the socket , a retaining feature restricts the motion of the module so that the module coupling site remains in contact with the socket coupling site .