Interactive Prototype
After discussing with the whole group, we decided that it is easier to implement our prototype in Javascript and use PHP for communication between the pages. The other options, such as Powerpoint and Flash, either does not provide functions we required or is difficult for us to code.
The prototype is able to run Scenario 1 and Scenario 2, which allows you to split all items evenly, split by each dish, and a mixture of both. We are not focusing on scenario 3, usage for a large group of people, since it seems to be more useful for small groups.
To run the prototype, go to:
http://www.students.olin.edu/2010/ysun/projects/hfid/prototype1/p1.php
and the receipt for your meal shown below: