Rudolph and Hoffman's 17th edition of Pediatrics is thinner than the previous edition. Can it possibly be as comprehensive? Indeed, the new edition has only 1,838 text pages compared with 2,032 text pages in the older edition; yet, on review, it becomes apparent that the new 17th edition carries on the tradition of presenting a comprehensive overview of pediatric knowledge. The editors made a conscious decision not to increase the size of the text to two volumes; instead, thinner paper was used. The authors used tables more frequently to present information, and appendices were included within the text rather than at the end. (I appreciated this last luxury.) In addition, some authors included algorithms to evaluate disorders such as proteinuria, pathways to illustrate the fate of biologic metabolites, and tables of differential diagnosis. All of these improvements present a wealth of information in a tight, concise, and informative way.