Scenario: We have both Winforms and MVC code that is being used to work on a nation wide multi-user platform that does lots of logistics for lots of users. Tax rules change per state and even per city or county. These tax rules make a huge difference for our industry. The other issue is that rules can change based on legislation. The system will have to handle cases where before a date it works one way and then different after that date. This changeover will need to be entered into the system and tested before that date comes. Proposed Solution: Use Workflow Foundation to create a time based system where our users can change and add rules that change the way taxes are calculated. Question: I have not used Workflow Foundation and searching has returned books to look at but not a lot of examples of people using this technology successfully. Is my scenario a good use of Workflow Foundation?(I think so.) If you have any experience with Workflow Foundation, any tips on making this work well?