I find that multiple projects are heavily used in Visual studio, because a lot tooling works better by splitting into projects instead. NCrunch is the example h

I find that multiple projects are heavily used in Visual studio, because a lot tooling works better by splitting into projects instead. NCrunch is the example here. It's easier to enforce dependency rules. A domain model should not have any dependencies on a specific technology, the easiest to way to enforce that is a separate project, with no references.