Complex systems

Previously, I said that business applications were not interesting from a programming perspective. Well, I think this is true in general, but there's probably one big exception: Enterprise Ressource Planning systems. These are pretty complex, allow plugins and customization to a big extent.
Another thing that identifies sophisticated systems is the modelling of not only data but also actions in the software. This is very important in ERP systems, so that decisions are traceable, and the output of employees or departments is visible.

This came to my mind during today's Business Information Management class. It may be a little off-topic, but it's good to see that there's interesting software around besides games.