To preface, I think this problem would be easier to understand if I gave an example: How does a complex tax evaluation application manage multiple tax laws and personal situations?
I inherited a web application which has a lot of business logic lodged in the views. This logic controls page flow and control visualization. The gist of this logic is based on properties of a context such as: what state was the action taken, who is the client, what type of task, and many more. example of such logic:
if task.state == "WA" then goto view1 else if task.type == "Wash Windows" && task.clientid == 5 then goto windowWashview2
feature requests come in all the time to add new tasks, with new rules. I've explored Domain Specific Languages briefly.