Dr. Poncelet and Dr. Hirsh eagerly developed an encyclopedic chapter for the 4th edition of the Guidebook for Clerkship Directors, and it seemed logical and proper to grow that chapter, which had been truncated for the Guidebook, into this book. They have assembled the leading international experts in the field of the medical school longitudinal integrated curriculum, who in turn have generated what we are sure will be considered the ultimate resource for these experiences. This book fills a significant void in the medical education literature.