What motivates one student to study hard and another to not study at all? How does personality develop and can it change? How and why do relationships fall apart? These and other questions lie at the heart of human psychology, which is the focus of ReferencePoint's Understanding Psychology series. Books in this series examine the mental and emotional factors that influence and shape human behavior. Careful, clear explanations; solid information; and insightful and fully documented quotes provide readers with a deeper understanding of what it is to be human. Book jacket.