I want to  make clear that chapter summaries can also be outlines: either would be fine.

Also, many people are not summarizing or outlining the whole chapter and/or providing adequate details about the chapter. Something that could help ensure that you have adequate details is this: suppose there was going to be a test over any aspects of the chapter and you could use your summary/outline for the test. Make your outline/summary as detailed as you'd want it to be to use for this test!