Scout, Tenderfoot, Second Class, and First Class is designed to teach Scoutcraft skills, teamwork, and self-reliance. Scout is the first rank, and requires demonstration of knowledge of Scouting's ideals, the process of rank advancement, troop and patrol structure, and some basic skills (e.g., knot-tying and knife safety). As with all other ranks, a Scoutmaster conference is also required. Further ranks have progressive requirements in the areas of Scoutcraft, physical fitness, citizenship, personal growth, and Scout Spirit. These ranks also require participation in a Board of Review. Scouts with a permanent mental or physical disability may use alternate requirements, based on their abilities and approved by the council.