This document discusses subjective well-being (SWB) and happiness. It provides statistics showing that 80% of US adults consider themselves happy or optimistic. It then examines elements of SWB, including happiness, life satisfaction, and emotional stability. Scales for measuring SWB are presented, including the Satisfaction with Life Scale. Research suggests SWB remains fairly stable over time and is correlated with psychological factors like self-esteem, optimism, and strong social relationships.