Analyze your need.
If you prepare food for large amounts of people and would regularly use the slicing, shredding, chopping and other functions of a food processor, you may be a candidate for buying one. If you aren't likely to drag out an appliance to grate cheese or shred carrots because it's easier to do it yourself manually, you probably don't need a food processor.
Consider the capacity you need.
A 2- or 7-c. bowl is likely to be big enough unless you usually make large quantities of food. Keep in mind that the larger the bowl of the food processor, the more it's likely to cost.
Decide whether you need any accessories.
Most food processors are sufficient without extras, but you may want to add extra slicing or shredding discs now or later. Make sure you have storage space for a food processor. It can be bulky, especially if it comes with extra discs and bowls.
Look for special features.
Look for mini bowls, feed chutes, number of speeds, pulsing function and whether blades are reversible. Plus, the heavier the base of your food processor, the less likely it is to move around when it's being used.
Look for extra functions.
Look for a juicing function if you're interested in making fruit or vegetable juices.
Check cleaning ease.
Check that the parts are dishwasher-safe. This saves cleanup time.
Take care of your investment.
Read warranties carefully, and check on service options and replaceable parts.