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We announce in this article that i) to each approximately nite dimensional factorR of any type there corresponds canonically a group coho- mological invariant, to be called the intrinsic invariant of R and denoted (R), on which Aut(R) acts canonically; ii) when a group G acts onR via : G 7! Aut(R), the pull back of Orb((R)), the orbit of (R) under Aut(R),by is a cocycle conjugacy invariant of ; iii) if G is a discrete count- able amenable group, then the pair of the module, mod(), and the above pull back is a complete invariant for the cocycle conjugacy class of .T his result settles the open problem of the general cocycle conjugacy classication of discrete amenable group actions on an AFD factor of type III1, and unies known results for other types.

THE INTRINSIC INVARIANT OF AN APPROXIMATELY FINITE DIMENSIONAL FACTOR AND THE COCYCLE CONJUGACY OF DISCRETE AMENABLE GROUP ACTIONS