Input (grade 13): He conducted more than 2,500 case studies over a period of 40 years and published twelve books, including Twenty Cases Suggestive of Reincarnation and Where Reincarnation and Biology Intersect.
Output (grade 12): He did more than 2,500 interviews over a period of 40 years and wrote twelve books, including Twenty Cases Suggestive of Reincarnation.