Rock Your Plot, which sells for $2.99 for an electronic download on Amazon.com. (Please note that you don't need a Kindle device to read, because there are free reading aps from Amazon that allow you to read books on your smart phone, tablet, and/or computer.)
Rock Your Plot provides an easy to understand and easy to follow process that actually works. The book can be read and the system can be implemented in a short period of time. The process addresses: Story Idea Testing; Goal, Motivation, Conflict; Character Sketches; Plot Points; Pinch Points; Trouble Shooting; Scene Construction Basics; and Creating an Outline.
Step Six of But HOW Do You Write a Book? includes several simple steps that are part of the system shared in Rock Your Plot.