pt. 1. Principles of relationship science: Basic facts and key concepts ; Research methods ; Our social nature -- pt. 2. Relationship development: Relationship beginnings ; Relationship initiation ; Relationship development ; Mate selection and marriage -- pt. 3. Relationship processes: Thinking and feeling ; Communicating and supporting ; Loving ; Sexing -- pt. 4. Relationship challenges: Rejection and betrayal ; Aggression and violence ; Conflict and loss ; Intervention.