1 Introduction: Complex Thought and Adult Intimate Relationships 1 -- 2 The Development of Complex Thought in Adulthood: Some Theories and Mechanisms that Grow with Interpersonal Experience 11 -- 3 The Big Picture: "New Science" Operations and Logics as a Way of Understanding Postformal Thought Operations and Intimate Relationship Processes 23 -- 4 Complex Thought and Emotionally Experienced Close Relationships 51 -- 5 Social, Cultural, and Historical Factors Relate to Cognitive Aspects of Intimate Relationships 67 -- 6 Cognition and Fundamental Complex Relationship Skills: Theory-Limited Nonclinical Literature Related to Cognitive Factors in Intimate Relationships 79 -- 7 Cognition and Fundamental Complex Relationship Skills: Some Preliminary Quantitative and Qualitative Research 97 -- 8 Cognitive Aspects of Close Relationships that Thrive: Practices for Dyads in Intimate Relationships 115 -- 9 Future Research that Includes Culture and History Effects 123.