Frank Lad The GHSZ argument: a gedankenexperiment requiring more denken (248K, Postscript) ABSTRACT. The wonderful gedankenexperiment of Greenberger, Horne, Shimony and Zeilinger has received only partial analysis in their seminal presentation. The analysis is completed here, yielding the consistent EPR model for which they searched. The fatal error leading to their flawed conclusion arises from the incompleteness of their analysis, an error of neglect.