Positive Psychology: The Science of Happiness and Human Strengths

The preface opens with Leopold Bloom's vision of a better world from Joyce's «Ulysses» and sets out positive psychology's aim: not to fix people's deficits but to build their strengths and well-being. Carr lists what is new in the second edition: positive psychotherapy, positive education, positive organizations and recent neuroscience research.

Chapter one describes positive psychology through three orientations: pleasure, engagement and meaning. Studies by Peterson and colleagues (845 adults) and Park and colleagues (24,836 people from 27 nations) show that all three relate to life satisfaction, but engagement and meaning predict it more strongly than pleasure.

The «circumplex model» of emotion is explained: although English has 550–600 emotion words, most can be placed on two dimensions — positive/negative and high/low arousal. Positive affect is linked to extraversion and negative affect to neuroticism, each with a heritability of about 0.5. Positive affect is associated with left prefrontal activation and the dopaminergic system, and can be boosted by regular exercise, adequate sleep, socializing with close friends and working toward valued goals.

The section on measuring happiness introduces well-known scales: according to 916 surveys of over a million people in 45 nations, average happiness is 6.75 out of 10 — most people consider themselves moderately happy. The book reproduces instruments such as the Satisfaction with Life Scale, the Oxford Happiness Inventory and the Warwick-Edinburgh Mental Well-being Scale in full, so readers can test themselves on the spot.

Barbara Fredrickson's «broaden-and-build» theory is one of the chapter's central ideas: negative emotions narrow our thought-action repertoire, while positive emotions broaden it and build lasting personal resources. The famous Nun Study — in which 180 nuns who expressed more positive emotion in autobiographies written as young women lived longer — is presented as the most cited evidence of happiness's effect on health.

Lyubomirsky's model is the chapter's practical takeaway: roughly 50% of individual differences in happiness come from partly genetic personality traits, 10% from circumstances (geography, income, marital status) and 40% from intentional activities. Carr presents this as encouraging, but adds a caution: maximal happiness doesn't mean success in every domain — according to Oishi's research, slightly less happy people can do better in income and education.

• Textbook structure: learning objectives, tables, scales, summaries, discussion questions
• Every claim is backed by a research reference
• Full versions of the measurement instruments allow self-assessment
• the text is hard to read in places