Authors outline their works differently. Some of them use the snowflake method, or index cards, or mind maps. Some folks do not like to plan and writing the story or project as they progress works best for them. However, my method has been different at times.
I have once discovered a more effective and quick way to get my stories down. And that is bulleting. I would write the chapter number and bullet the events that happen in each chapter. I would then check them off one at a time as I complete them.
On the flipside, though, it can be time-consuming to get all the chapter bullets for your whole story, depending on its length or complexity. I have tried being a pantser rather than a plotter. But planning helps me the best. Writing and planning at the same time is not always easy.
On the bright side, it is easier to follow the bulleted outline and not unintentionally change things. There were a few exceptions for me where I either removed or changed bullet points. But generally, I follow the bulleted events better than the summaries.