This part of the study explores the effectiveness of the review media in terms of speed of reviewing, comprehensiveness of review treatment, and authority. The time lags for the fifty-four journals varied widely, the mean ranging from 5.8 months to forty-two months. The time lags for all 3,347 reviews varied even more widely, ranging from less than a month to 108 months after a book was off the press. The 3,347 reviews had a mean time lag of 10.43 months and a standard deviation of 6.63 months.