Given this focus on classification, a useful way of examining the significance of these and similar books - and of doctrinal scholarship generally - is by assessing the books in the light of certain general questions about the role of classification in law, in particular questions about the role of classification when it is done in the traditional or doctrinal sense. Three questions about classification in law will be addressed: (I) Why (classify)?, (II) How (to classify)?, and (III) What (to classify)? The conclusion of the review is that doctrinal scholarship of the sort exemplified in the reviewed books is academically significant - indeed it is indispensable.