Decoherent Histories Quantum Mechanics Starting with Records of What   Happens
  We present a formulation of the decoherent (or consistent) histories quantum theory of closed systems starting with records of what histories happen. Alternative routes to a formulation of quantum theory like this one can be useful both for understanding quantum mechanics and for generalizing and extending it to new realms of application and experimental test. 
James B. Hartle
quant-ph gr-qc hep-th