My students and I love reading The One and Only Ivan and then learning about what is known about Ivan from his life. The One and Only Bob could never be used as a sequel, because Ms. Applegate takes great liberty in Ivan's adventures, to the point of being unrealistic. Many of the details presented in this book directly contradict facts from the first book, like time period, and any student who pays attention will catch on to the discrepancies. Instead of the profoundly moving, intimately chosen words to represent Ivan's thoughts, she resorts to using modern day slang when Bob is talking. She uses the phrase, "I may or may not have" ad naseum. While Bob was a rescue, the amount of time that had passed for the setting of this book, and knowing that he is admittedly spoiled, he would have lost his wanna-be street attitude. It possibly could be an okay read on its own, but the ending is predictably cliche, and definitely could not be taught as a sequel. I wouldn't use this book in my classroom period.