Collapsible lightweight chairs having a pack weight of twenty ounces or less, and having enhanced side to side and front to back chair frame stability, and having a detachable back such that a variety of chair back supports may be utilized. The first holding member integrally includes a body portion and a memory member holding portion so as to sandwich the memory member in a state where the body portion engages with the front end portion of the memory member. The granular assessment data includes a result of at least one assessment administered to respective students, wherein each assessment includes a plurality of problems for assessing at least one of the students and the associated result includes an independent evaluation of each respective problem.