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Signatures of quadratic forms have been generalized to hermitian forms overalgebras with involution. In the literature this is done via Morita theory,which causes sign ambiguities in certain cases. In this paper, a hermitianversion of the Knebusch Trace Formula is established and used as a main tool toresolve these ambiguities.  The last page is an erratum for the published version. We inadvertently (I)gave an incorrect definition of adjoint involutions; (II) omitted dealing withthe case $(H\times H, \widehat{\phantom{m}}\,)$. As $W(H\times H,\widehat{\phantom{m}}\,)= W(R\times R, \widehat{\phantom{m}}\,)=0$, theomission does not affect our reasoning or our results. For the sake ofcompleteness we point out where some small changes should be made in thepublished version.

Signatures of hermitian forms and the Knebusch Trace Formula