We consider the e¢ cient allocation of a single good with interdependent values in a quasi-linear environment. We present an approach to modelling interdependent preferences distinguishing between "payo¤ types" and "belief types" and report a characterization of when the e¢ cient allocation can be partially Bayesian implemented on a ...nite type space. The characterization can be used to unify a number of su¢ cient conditions for e¢ cient partial implementation in this classical auction

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... We report how a canonical language for discussing interdependent types -developed in a more general setting by Bergemann, Morris and Takahashi (2011) -applies in this setting and note by example that this canonical language will not allow us to distinguish some types in the payo¤ type -belief type language.