Here is a site that provides a good description of what Actors are and how to create Use Cases:
http://www.objectmentor.com/courses/resources/articles/usecases.pdf
I have entered a number of scenarios based off of my wife's business to start others thinking about interactions that they'd like the system to support. If you have a different perspective, even slightly different, please submit your own version. The more perspective's we have, the better the overall design will be.
A note on scenarios. The more details that you provide about the individuals and timing, the better Use Cases we will be able to create from them.... read more
We are going to try to follow UML design. Please see http://bdn.borland.com/article/0,1410,31863,00.html for an overview