+1 ... and it's been known for a long time. Back in the '70s, Fred Brooks said "Show me your [code] and conceal your [data structures], and I shall continue to

+1 ... and it's been known for a long time. Back in the '70s, Fred Brooks said "Show me your [code] and conceal your [data structures], and I shall continue to be mystified. Show me your [data structures], and I won't usually need your [code]; it'll be obvious."