What is "allumwandlung"

Allumwandlung (German for "complete promotion", sometimes abbreviated AUW) is a chess problem where, at some stage in the solution, a pawn (or sometimes pawns) is promoted variously to a queen, rook, bishop, and knight. Allumwandlung's main requirement is promotion, either a white pawn or a black pawn. A Babson task may appear if both pawns are spotted in an individual problem, corresponding one another.