Let's say you have an uphill battle ahead of you, maybe it is a project that you know will be challenging and you are going to need to rely on someone, REALLY rely on them.
"I expect you to" .... ugh! I cringe when I hear that phrase, partly because I have used it before and also because it doesn't work most of the time, especially when said in a mandatory-like tone.
People want to live up to high expectations but they do best when someone takes the little time to express BELIEF that they WILL do it....that they are already capable of doing it....not because it is "expected" of them by YOU. It's not your expectations that will motivate them as much as their expectation. So instead be a catalyst to help them see their own capabilities.
A few short comments can do wonders for somebody's confidence....especially at the outset of a project.
"You will do great at ..."
"I can't wait to see how you ..."
"I suspect you will thrive ..."
If they take your comments and run ... GREAT. If they have any doubts ... ask a follow-up question: "What do we need to do to help you ......... ?"
Expect greatness, but express to them THEIR greatness, and you will get it.