What is your budget?
What is going to be the main use of the car?
Small inner city
How many passenger will you usually be carrying?
How big a boot do you need?
Specific tasks you will be doing?
Any brands you would prefer? Any brands you hate?
What features in the car are important to you?
What gearbox do you want?
Are aesthetics of the car important?
What is the minimum fuel consumption you require?
...or passed with flying colours?