Conflict may be defined as a situation of competition in which the parties are aware of the incompatibility of potential future positions, and in which each party wishes to occupy a position that is incompatible with the wishes of the other.

A conflict is to be characterized psychologically as a situation in which oppositely directed, simultaneously acting forces of approximately equal strength work upon the individual.

Conflict is viewed as the active striving for one's own preferred outcome which, if attained, precludes the attainment by others of their own preferred outcome, thereby producing hostility.

Conflict may be personal, interpersonal, or between rival groups or coalitions. It may be built into organizational structures, roles, attitudes, and stereotypes or arise over a scarcity of resources. It may be explicit or covert. Whatever the reason, and whatever the form it takes, its source rests in some perceived or real divergence of interests.

Conflict can be viewed as repeated cycles of observing, orienting, deciding and acting by both sides, and also, I might add, at all levels. The adversary that can move through these cycles faster gains an inestimable advantage by disrupting his enemy's ability to respond effectively.

Conflict exists only when there are two opposing things: fear and non-fear,violence and non-violence.

Conflict... is a theme that has occupied the thinking of man more than any other, save only God and love. In the vast output of discourse on the subject, conflict has been treated in every conceivable way. It has been treated descriptively, as in history and fiction; it has been treated in an aura of moral approval, as in epos; with implicit resignation, as in tragedy; with moral disapproval, as in pacifistic religions. There is a body of knowledge called military science, presumably concerned with strategies of armed conflict. There are innumerable handbooks, which teach how to play specific games of strategy. Psychoanalysts are investigating the genesis of "fight-like" situations within the individual, and social psychologists are doing the same on the level of groups and social classes.

Political conflict is not like an intercollegiate debate in which the opponents agree in advance on a definition of the issues. As a matter of fact, the definition of the alternatives is the supreme instrument of power; the antagonists can rarely agree on what the issues are because power is involved in the definition.

Before we can proceed to a formal definition of conflict we must examine another concept, that of behavior space. The position of a behavior unit at a moment of time is defined by a set of values (subset, to be technical) of a set of variables that defines the behavior unit. These variables need not be continuous or quantitatively measurable. The different values of a variable must, however, be capable of simple ordering; that is, of any two values it must be possible to say that one is 'after' (higher, lefter, brighter than) the other.

The purpose of conflict is to create.

Accordingly, three fundamental types of the conflict situation are possible.
i. The individual stands between two positive valences of approximately equal strength (Fig. 7). An instance of this sort is that of Buridan's ass starving between two stacks of hay. In general this type of conflict situation is solved with relative ease. It is usually a condition of labile equilibrium.

Conflict is the gadfly of thought. It stirs us to observation and memory. It instigates invention. It shocks us out of sheep-like passivity, and sets us at noting and contriving…conflict is a sine qua non of reflection and ingenuity.

The cause of conflict is some fixed idea or one-sided idea. When everyone knows the value of pure practice, we will have little conflict in our world.

The conflict which we have to fight is still a conflict of tariffs. In every country resolutions are being formed and plans are being worked out for limiting still further the intercourse of nations with each other and interposing new barriers of tariff. ... And as years go on we shall have to fight that battle. ... It is the world's conflict of the future.