This is a school assignment regarding Social Web.
What it is:
http://www.wiebetaaltwat.nl is a website where you can keep a list of your expenditure. Each participant can offset his/her joint expenditure. http://www.wiebetaaltwat.nl is used for example: house list, groceries, sport clubs, festivals and holidays.
Why it is cool:
It is cool because you don’t have to calculate any more, this site will do it for you. Everything is distributed fairly and this will safe you some confusion. This way you also have a overview of your monthly spending on groceries.