On a Franklin planner, when a task has started but for some reason is incomplete, you mark a little dot or bullet on it. Once it is complete, you check it off. If it needs to the next day or some day in the future, you place an arrow and then move it.

Simpleology has the second two options covered, but the first is missing. When i'm looking at my list of tasks, it would be great to see that I'm making progress, even if the task is moving with me from day to day.

http://www.franklinplannertalk.com/category/infographics/