When You Are Bringing the Dish:

-Portability: Choose a dish that travels well, that you can keep hot or cold as the dish requires, or that needs minimal tending to when it reaches its destination. Let your host know if you will need a burner or oven or fridge space when you and your dish arrive.

-Theme: Is the meal going to be Italian or Spanish? Casual or formal? Kids and adults? Ask a few questions, and you can plan your dish from there.

-Amount: How many people? Are you the only one bringing dessert, or will there be more?

When You are Hosting the Potluck:

-Make sure you have all the courses covered: As you assign dishes, write them down and make sure you have all the food groups you want.

-Serving platters and utensils: Will your guest bring their own, or will they need to use yours? Have extras on hand.

-Last minute prep: Will a dish need to be reheated or chilled? Will the guest need any kitchen space to do any last minute prep? Be prepared by having some spare space in the fridge, and an extra burner or oven rack available, if possible.

-Plot the timing of all the dishes, so that they can all be ready at the same time. Make as many dishes as possible that can be prepared ahead and served at room temperature (or at the very least find recipes that don't say "serve immediately"). And plan the serving table or buffet, making sure you have enough space for all the dishes.

-Offer non-cooks an opportunity to bring something like wine, chocolate, bread, or cheeses.

And whether you are hosting or attending:

-Dietary restrictions: Don't forget to discuss dietary allergies and aversions. Better safe than sorry, especially if there are young kids around. Also be aware of any vegetarians at the gathering, and make sure there are options for them.

-Print out the recipe or an ingredient list: Again, the allergy thing is more prevalent than you might think. Having a list of the ingredients at hand cuts right to the chase.