Two questions regarding decoherence 1) preferred pointer basis: Decoherence explains why a quantum object interacting with a measurement device plus environemt results in a "classical state" of the measurement device. What is the explanation for a "preferred pointer basis"and why does the "classicalization" i.e. "localization" takes place in position space (why not momentum space)? 2) double slit experiment: In a double slit experiment with single quantum objects passing through the slits these quantum objects appear as localized dots at a screen behind the slits. This localization is caused by decoherence due to interaction with the environment after interference took place. But the individual quantum objects interact with environment already when passing through the slits; so why does localization not take place earlier (which would mean that no interference pattern does appear)?