We live in a world where there are many different names for to-do lists: Action items, Tasks at hand, Honey-Do lists, etc. But whatever you choose to call it, the actual purpose of the list is the same: A place for all the things you need to accomplish.
Make a List
Though it may seem like a lot of work, one of the best things you can do to help yourself succeed is to sit down and make a list of everything you need to do. Finish a report, turn in your timesheet, prepare for the marketing meeting, go to the grocery store, etc. For every item on the list, include a by-when so that you can prioritize.