Extraits du livre "The Decision Book", écrit par Mikael Krogerus et Roman Tschäooeler, et publié pour la première fois en anglais en 2011 par Profil Books Ltd : 

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"Over thousand years ago, Aristotle came to the unsurprising conclusion that what a person wants above all is to be happy. 

In 1961, the US psychologist Mihaly Csikszentmihalyi looked for a term that described the state of feeling happy. He called it "flow".

After interviewing over a thousand people about what made them happy, he found that all the responses had five things in common. Happiness, or "flow", occurs when we are :

- intensely focused on an activity

- of our own choosing, that is

- neither under-challenging, nor over-challenging, that as

- a clear objective, and that receives

- immediate feedback."

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