Even before you invest in James Scott’s The Book on PPM’s Series, he offers online videos to help you decide which book you need. After all, when your objective is fiscal responsibility, wasting money on a volume you do not need seems counterproductive. Each volume in the series details a different type of PPM allowed under SEC Regulation D. These are covered under Rule 504, Rule 505, and Rule 506. Essentially separated by the size of investment you seek, each also comes with a separate set of compliance requirements and qualifications. These books not only help you make the right choice, but keep you from making costly errors.