joe.eager (12/13/2013)
I agree, on doing small slices of the data model, I guess I'm just worried about the re-factoring chunks near the end. But as was mentioned earlier, those stories will take longer since they involve re-factoring and moving data into the new model.
To be honest that's the part that sticks in my craw a little, too. It's a bit of a leap of faith that a lot of late sprint refactoring will add enough business value that it's worth it. The idea is that the final design will be more efficient/stable, etc. b/c it wasn't set in stone early in the project (which is the stage when you know the least about what the final product will look like).