Thinking about project learning this morning reminded me of the Chinese proverb - "Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime."
I got to playing with the words and here is an adaptation of the proverb as it relates to learning for the short-term test versus learning for long-term understanding.
Give your students an answer and they will remember it for a day. Teach your students through a project and they will know for a lifetime.