Being happy is as easy as ABC. Well, 'S+C+V', anyway. All you need is a positive outlook (though 60 grand doesn't hurt). And if you can't manage that, you can always turn to cognitive behaviour therapy, with its ideology of focusing on the here and now. But is it really healthy to be relentlessly chipper? Elizabeth Heathcote investigates

The Noughties were never going to be good for pessimists. The tone for the decade was set in 1997. As a grinning Tony Blair romped home to a soundtrack of "Things Can Only Get Better", an American psychologist named Martin Seligman, renowned in his field for his work on "learnt helplessness", was elected president of the American Psychological Association. Within months, he announced that having devoted 35 years to the study of human suffering and mental illness - the standard fare of psychologists - he would use the platform to explore human happiness instead.

The idea wasn't new - since the 1950s, voices in the American psychological community had been suggesting that the discipline would benefit from an arm devoted to what makes us feel good rather than bad. But Seligman was the one who did it. In 2000, he set up the Positive Psychology Centre at the University of Pennsylvania and the tentacles of the movement have been spreading ever since.

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The Independent, Sunday 20 June 2010