Writing is an active thinking process and your thoughts come and go. Before you know it, you’ve spent 3 hours going from paper to paper, making revelations and coming up with news hypotheses. However, you are standing in a complete mess, not knowing where you read this or got that idea. Sounds familiar?
When you do a literature search looking for a piece of information, write a search log.
In it you should write why you did this search, the papers you found, and most certainly other interesting things you find while looking for your primary goal. This helps you stay focused on the task at hand and doing it efficiently