The [[SchrodingerSchrödinger equation]] describes quantum systems but does not describe their measurement. Solution to the equations include all possible observable values for measurements, but measurements only result in one definite outcome. This difference is called the [[measurement problem]] of quantum mechanics. To predict measurement outcomes from quantum solutions, the orthodox interpretation of quantum theory postulates wave function collapse and uses the [[Born rule]] to compute the probable outcomes.<ref>{{Cite journal |last=Zurek |first=Wojciech Hubert |date=2003-05-22 |title=Decoherence, einselection, and the quantum origins of the classical |url=https://link.aps.org/doi/10.1103/RevModPhys.75.715 |journal=Reviews of Modern Physics |language=en |volume=75 |issue=3 |pages=715–775 |doi=10.1103/RevModPhys.75.715 |issn=0034-6861|arxiv=quant-ph/0105127 }}</ref> Despite the widespread quantitative success of these postulates scientists remain dissatisfied and have sought more detailed physical models. Rather than suspending the Schrodinger equation during the process of measurement, the measurement apparatus should be included and governed by the laws of quantum mechanics.<ref>{{Cite book |last=Susskind |first=Leonard |title=Quantum mechanics: the theoretical minimum; [what you need to know to start doing physics] |last2=Friedman |first2=Art |last3=Susskind |first3=Leonard |date=2014 |publisher=Basic Books |isbn=978-0-465-06290-4 |series=The theoretical minimum / Leonard Susskind and George Hrabovsky |___location=New York, NY}}</ref>{{rp|127}}
