 Cuffaro (2012) and Aaronson (2013b) point out that the Many Worlds Explanation of Quantum Computing (MWQC) and the MWI are not actually identical. The latter employs  decoherence  as a criterion for distinguishing macroscopic worlds from one another. Quantum circuit model algorithms, however, utilise coherent superpositions. To distinguish computational worlds, therefore, one must weaken the decoherence criterion, but Cuffaro argues that this move is ad hoc. Further, Cuffaro argues that the MWQC is for all practical purposes incompatible with  measurement based computation,  for even granting a weakened world identification criterion, there is no natural way in this model to identify worlds that are stable and independent in the way required.