An LSAT reasoning flaw that improperly transfers a property between a group and its individual members. Two directions exist: Composition (Part to Whole) infers a property of the whole from a property of its parts — e.g., "each player is outstanding, so the team will outperform every other team." Division (Whole to Part) infers a property of a part from a property of the whole — e.g., "this class collected the most cans, so the top individual collector must be in this class." LSAT phrasing: "infers from the group that an individual..." or vice versa.