“…Using the previously indicated fact that X may be assumed to be a product of K(x, w)'s, we next construct a homology isomorphism of DGA-algebras a: C*(X)-+H*(X). We may then replace {£ r (A, C*(B), C*(X))} by {£ r (A, C*(B) 9 H*(X))}. By keeping track of how a acts on iterated Ui-products, we can show how to calculate, without recourse to the cochain level, all matric Massey products relevant to the computation of the higher differentials.…”