This is identical to the picture I would have used to describe this library: http://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/MVC-Process.svg/400px-MVC-

This is identical to the picture I would have used to describe this library: http://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/MVC-Process.svg/400px-MVC-Process.svg.png http://upload.wikimedia.org/wikipedia/commons/thumb/a/a0/MVC... The only weird bit is that MVC in, say, Rails also lets the model talk to the database. This can (and has) been considered to be a mistake. It's not a three-tiered architecture, though, if that's what you're looking for.