 There are a wide range of approaches to the foundations of quantum mechanics, however (see also the entry on  philosophical issues in quantum theory).  In some cases, one just needs to point out how an approach fits into the overall picture suggested by decoherence, other approaches are in fact less able to exploit the results of decoherence. (The term ‘approach’ here is more appropriate than the term ‘interpretation’, because several of these are in fact modifications of or additions to the theory.) We shall thus discuss in turn a number of approaches and how they relate to decoherence. These will be: the three most widespread approaches in the philosophy of physics (Everett, Bohm and GRW), followed by the more ‘orthodox’ approaches of von Neumann, Heisenberg and Bohr, and a few others.