Graphs your four biorhythms (intuitive, intellectual, emotional, physical) in your choice of color, starting date, and duration. Analyzes your high, low, and critical days. Calculates the coincidence of critical days of specified rhythms. Compares biorhythms of two people and checks for their compatibility. Has an extensive help system and friendly interface. Allows user to save, save as, open, and print his biorhythm graphs; and does much more.