THE CONGRESSES are the milestones, the landmarks, the legendary LRH lectures wherein he announced his latest monumental breakthroughs and triumphs along the developmental path of research. The Congresses contain the successive landmark discoveries and developments subsequent to the Basics. While the Professional and Advanced Clinical Courses (ACCs) are LRH's instruction to auditors, the Congresses are his presentations to all Scientologists, each series representing a full body of tech for application in life. Congresses may be listened to individually, but the benefits of a full chronological study of the Congresses after the Basics are beyond measure.