This is the first of a series of four papers describing the finitely genera
ted modules over all commutative noetherian rings that do not have wild rep
resentation type ( with a possible exception involving characteristic 2). T
his first paper identifies the wild rings, in the complete local case. The
second paper describes the finitely generated modules over the remaining co
mplete local rings. The last two papers extend these results by dropping th
e complete local hypothesis.