Book Cover; Title; Copyright; Contents; About the Editors; Contributors; Series Editors' Foreword; Preface; Introduction; PART I KNOWLEDGE SYSTEMS; CHAPTER 1 Transactive Memory: Learning Who Knows What in Work Groups and Organizations; CHAPTER 2 "Saying Is Believing" Effects: When Sharing Reality About Something Biases Knowledge and Evaluations; CHAPTER 3 The Uncertain Role of Unshared Information in Collective Choice; CHAPTER 4 Dirty Secrets: Strategic Uses of Ignorance and Uncertainty; PART II EMOTIONAL AND MOTIVATIONAL SYSTEMS