How does the author structure the nonfiction book, Help, Thanks, Wow?

This short book is divided into four chapters plus a preface. The longest chapter the one entitled “Help” which is twenty-nine pages while the shortest one is the preface at ten pages. No timeline is established in the book. Lamott tells several stories but there are no time references given to any of these stories. The book is, however, told in the present tense. Each chapter focuses on a certain topic. For instance, in the preface Lamott defines prayer. In the second chapter she writes about prayers in which the supplicant seeks help. The third chapter deals with prayers offered to thank God, while the fourth deals with those spoken in amazement of what He has done.