Happiness and Aristotle's Definition of Eudaimonia

Happiness is a much debated topic in both ancient and contemporary philosophy. The aim of this paper is twofold: first, to establish what are the necesssary and sufficient conditions of eudaimonia for Aristotle in Book I of Nicomachean Ethics; and secondly, to show how Aristotle’s theory is also a good answer to the questions of the contemporary common sense about what happiness is and how to achieve it. In this way, I would suggest new arguments to give a new voice to Aristotle in the contemporary philosophical debate on this issue. My paper is therefore only tangentially a contribution to this debate and remains essentially an essay on the philosophy of Aristotle.