(a) We determine the indoor useable activity space by:(1) Measuring all indoor useable activity space from wall to wall on the inside at floor level;(2) Rounding all measurements up to the nearest inch;(3) Excluding single-use areas, which are areas not routinely used for children's activities, such as a bathroom, hallway, storage room, cooking area of a kitchen, swimming pool, and storage building; and(4) Excluding floor space occupied by permanent and stationary fixtures, such as built-in bookcases, shelving, and storage/counter space that is not intended for use by children.(b) We use the sum of the measurements to calculate the indoor useable activity space and to determine the maximum number of children you may care for.