  Everett's Relative State Interpretation has gained increasing interest due to
the progress of understanding the role of decoherence. In order to fulfill its
promise as a realistic description of the physical world, two postulates are
formulated. In short they are 1) for a system with continuous coordinates
$\vec{x}$, discrete variable $j$, and state $\psi_j(\vec{x})$, the density
$\rho_j(\vec{x})=|\psi_j(\vec{x})|^2$ gives the distribution of the location of
the system with the respect to the variables $\vec{x}$ and $j$; 2) an equation
of motion for the state $i\hbar \partial_t \psi = H\psi$. The first postulate
connects the mathematical description to the physical reality, which has been
missing in previous versions. The contents of the standard (Copenhagen)
postulates are derived, including the appearance of Hilbert space and the Born
rule. The approach to probabilities earlier proposed by Greaves replaces the
classical probability concept in the Born rule. The new quantum probability
concept, earlier advocated by Deutsch and Wallace, is void of the requirement
of uncertainty.
