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Concrete slump

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Does anyone have experience or know of technical resources that address the change of concrete slump during placement by pumping.

I have been told that the pumping process changes the concrete slump.
1. Is this correct?
2. If pumping does change the slump does the slump increase or decrease?
3. Without additives, i.e. plastizers, water reducers, etc. isn't  the slump test basically a measure of the relative water content in the mix?
4. If the slump changes where does the additional water come from if the slump increases or where does the water go to if the slump decreases?
5. If the pumping process changes the slump, what is the slump? Is it the slump of the design mix prior to pumping or after?

Thanks for your assistance.

James Allen, P.E
Homer, AK