His intention was not to simply define Noahide law in terms of an expanded list of sixty six laws, rather only to prove that the volume of Noahide Law is greater - when compared to the volume of Israelite Law - than a ratio of 7 to 613 would indicate. His book "The Seven Laws of Noah" demonstrates the breadth of Noahic legislation.<ref>[[Aaron Lichtenstein|Lichtenstein, Aaron]]. "The Seven Laws of Noah". New York: The Rabbi Jacob Joseph School Press and Z. Berman Books, 2d ed. 1986</ref>
His study of Noahism concentrates on those aspects of Jewish law which Jew and Gentile have in common. Rabbi Lichtenstein felt this was necessary in order to effect the comparison which comprised the essence of his study. In due course, however, he came across instances of point-blank dissimilarity in legislation for Noahide and Jew. Some of these dissimilarities were treated in passing.<ref>See "Seven Laws of Noah" Notes 43, 56, 66, 80, 81, 85, 134, 135, 136.</ref> Seen from the present vantage point, a systematic study of the why, where, when, what, and how of these varying legal dicta is the next necessary step toward gaining insight into the substance of Noahism.<ref>A recent, limited example of this approach is Aaron Kirshenbaum's "The Rule 'no man may incriminate himself' in the Noahide Laws," Dine Israel, Annual of Jewish Law and Israeli Family Law. (Z. Falk and A. Kirshenbaum editors), Tel Aviv University, Volume 2 pages 71-82</ref>
