To solve a problem or to reach a goal, you don't need to know all the answers in advance. But you must have a clear idea of the problem or the goal you want to reach.
Bio: Robert Porter Allen 28 June 1963 was an American ornithologist and environmentalist. He achieved worldwide attention for his rescue operations of the whooping crane in the 1940s and 1950s. Allen helped save the Roseate Spoonbill from extinction.