Their beliefs
Do they want to travel? What is their favourite kind of holiday?
Are they religious or an atheist? If they are religious are they willing to date you if you're not? How will this affect your future decisions such as marriage and children?
Family
Are they close to their family? Are you to yours? If not, are you willing to spend a lot of time with theirs and if you are vice versa? Often a parent's relationship can be indicative of what they expect from theirs so it's a good measure of what you can expect.
Sex
How often do they feel they need a physical relationship with you? And how often do you want to have sex with your partner? If these differ considerably then you may need to think about ways to meet in the middle or if you are in fact suited to one another.
Relationship definition
Does one of you want marriage and kids while the other is happy to live together and get a pet? If you don't agree on such big future decisions then this relationship might not be the one for you. If they keep putting it off does it mean that they really don't want it after all?
Conflict resolution
Do you both walk away without discussing your disagreements? Or do you sit down with each other when the dust has settled and talk thought it? Do you apologise after an argument? Communication is essential when there are differing points of view and how you handle this is important-if you both leave fights unresolved then your problems will become so big that you won't be able to remember what one single fight was about in the first place.
Hobbies and interests
What are their interests outside of work? Can you cope with them setting aside time away from you to pursue them? Can you get involved in them? Can you tolerate them talking about their passions often?
Friends
Find out who they deem their best mates- are you able to get on with them too? Do you feel included in his group of friends or excluded because they have all been friends for a long time? Are you happy to go out with them as a big group or would you rather keep your friendship separate?
Social life
Being honest about what you do when you are apart is a useful tool to gauge what sort of life they lead. If they are a heavy clubber and you like night in- are you going to get along in the long term? Are you both willing to compromise and do things that your other half wants to do even if it's not what you would do?
Money
Does your partner blow money or save it? Do they save for big items or go into debt for them? Be aware of your own spending habits and communicate to each other what they are.
Future goals
Check out each other's things to do before list- are you willing to support your partner in their dreams of starting their own business, travelling around the world or a financial goal? If you share them all- great- but if not- will you be there for them and help them get there?
Inspired by article on eHarmony