Think about these cases:
1) A detective have found out a bunch of clues in the last three months. Now, he needs to spend two or three days to arrange/ summarize / absorb these clues to draw a conclusion.
2) A student spent a whole day in the school. That night at home he decided to arrange / summarize / absorb / digest what he learned that day.
What's the best word (or phrase) to describe the process to arrange some disorganized information to get a more thorough and deeper understanding?