What
- What, specifically,...?
- What next?
- What else?
Where
- Where else?
- Where are you?
- Where, exactly...?
When
- When, exactly, will you...?
- When will it start/end?
- When will I know?
Why
- Why does that happen?
- Why not?
- (just keep asking 'why?' to find root cause - often around 5 times)
How
- How many?
- How much?
- How does it work?
Who
- Who will do this?
- Who else will do this?
- Who pays?
- Who benefits?
