Friendship as Responsivity, Cooperation, and Coordination
The definitions of friendship presented in the previous section refer only to the most basic criterion or feature of friendship (i.e., mutual liking). Certainly, there is more to friendship than this fundamental defining characteristic. In this section, we show that the interactions of friends differ substantially from the interactions of nonfriends. The centerpiece of this discussion is well known, specifically, that reciprocity is a fundamental characteristic of friendship.
Beyond the simple reciprocity of liking discussed in the previous section, we show that reciprocity between friends can be seen in several domains, including affect and behavior. “Reciprocity” refers to the tendency of two persons to act in the same way, either simultaneously or in sequence (Hinde, 1979). Typically, reciprocity is directional in the sense that actions of friends are directed toward each other, such as when one friend does something and the other friend responds (Ross, Cheyne, & Lollis, 1988). +Continue Reading
In the summer of ’62, 
While the emphasis in recent years has been on positive emotions, health and well-being and how normal people flourish, Lazarus (2003)cautions us about only emphasizing the positive without due regard to the part that negative emotions play: `We need the bad, which is part of life, to fully appreciate the good.
Long before the advent of the positive movement in psychology, researchers were interested in what makes people happy. The concept of health is more than the mere absence of illness: it contains mental and social well-being. Debates around the importance of genetic disposition, material possessions, social relationships, family support have surrounded the concept of happiness. More recently concepts such as well-being, resilience, engagement and flow have been added to the mix. We could ask, why the flurry of interest in happiness? Classic philosophers like Nietzsche, Kant and Schopenhauer were preoccupied with the meaning of life, the angst that went with the human struggle to exist, and today we are all looking for an illusive perpetual state of happiness. 
