The Rule of 5 simply states that you must do 5 things every day that lead you towards your goal. Chunking down your goals into smaller action steps help you to persist daily, and it will pay off handsomely. 
When my team and I had the goal of getting Chicken Soup for the Soul to the top of the New York Times Bestsellers list, we implemented The Rule of 5 every day, doing things such as giving five radio interviews, sending out five books to reviewers, asking five network marketing companies to buy the book as a motivational tool for their sales people, or giving a seminar to at least five people and selling the book at the back of the room. All these little actions at a time add up, and the Rule of 5 led me to great success.