Sometimes you'll hear a software engineer say, "I have finished the design. All that's left is its documentation." This makes no sense. Can you imagine a building architect saying, "I have completed the design of your new home. All that's left is to draw a picture of it," or a novelist saying, "I have completed the novel. All that's left is to write it"? Design is the selection, abstraction, and recording of an appropriate architecture and algorithm onto paper or other medium.