Create a visual work flow which will guide user through the creation of scenarios, analysis, etc.. and allow them to go back to add/edit input similar to the Tax software like TurboTax.

A related issue from the annual meeting which referenced visual workflow:
Issue: Provenance & relationship among datasets
comment: 2.1 has a view that shows what datasets are inputs to other datasets. This, combined with the visual workflow (item 40), will solve this