The most efficient I have ever been was when we had 4 of us sat around a large desk, a coder doing UI, a coder doing back-end, a user/business expert and a data

The most efficient I have ever been was when we had 4 of us sat around a large desk, a coder doing UI, a coder doing back-end, a user/business expert and a data-migration expert. When I wanted to check what was going on, I just had to twist my monitor and point at it to ask if I was doing the right thing. Vastly superior to even working 30 feet from someone else.