A man is flying in a hot air balloon and realizes he is lost. He reduces height and spots a man down below. He lowers the balloon further and shouts: "Excuse me, can you help me? I promised my friend I would meet him half an hour ago, but I don't know where I am."
The man below says: "Yes you're in a hot air balloon, hovering 30 feet above this field between 40 & 41 degrees latitude and 120 and 124 degrees West longitude."
"You must be an Architect," says the balloonist.
"I am" replies the man. "How did you know?"
"Well" says the balloonist, "everything you have told me is technically correct, but it's of absolutely no use to me and I still don't know where I am."
The man below says, "You must be a contractor."
"Well yes" replies the balloonist, "but how did you know?"
"Well", says the man, "You don't know where you are or where you're going. You've made a promise that you can't keep, but now you expect me to solve your problem. You're in the same position as you were before we met, but now it's my fault."
Excellent, thanks