obtained when a person's partner is proficient in handling tasks, such as getting all the laundry finished. Instrumental costs are just the opposite; they occur when a person's relationship partner causes unnecessary work or the partner impedes the other's progress in a task, such as one person in a relationship not doing any of the housework. Opportunity Opportunity rewards and costs are associated with the opportunities that arise in relationships. Opportunity rewards are those gains that a person is able to receive in their relationship, which they would not be able to receive on their own. Opportunity costs occur when a person must give up something that they normally would not for the sake of the relationship. Outcome Transformation. Outcome transformation is the concept that individuals may take into account their own outcomes as well as the outcome for the other individual in the interaction. There are orientations that individuals take when considering outcomes for the other individual in an interaction (known as nonidividualistic orientations of outcome transformation). These nonidividualistic orientations of outcome transformation include the following: Cooperation (MaxJoint): maximizes joint outcomes Equality (MinDiff): minimizes differences in outcomes Altruism (MaxOther): maximizes positive outcomes for others Aggression (MinOther) minimizes positive outcomes for others Principle of interaction (SABI: I = ƒ[A, B, S]) The Principle of Interaction (also referred to as the SABI model) is used to assess the variable that affect any given interaction. This model states that Interactions (I) are a function (ƒ) of the situation, Person A's (A) motives, traits, and actions, plus Person B's (B) motives, traits, and actions (I = ƒ[A, B, S]). There are several factors that individuals bring to the Interaction. They are their consideration of Outcomes, Comparison Level, and Comparison Level for Alternatives. Outcomes With every relationship there is an outcome. These outcomes are determined by comparing the amount of rewards present in a relationship versus the amount of costs present. "According to interdependence theory, people mentally account for rewards and costs so they can evaluate the outcome of their relationship as either positive or negative." The outcome is determined to be positive when the rewards outweigh the costs in a relationship. Conversely, the outcome is negative when the costs outweigh the rewards. Comparison level (CL) Interdependence theory also takes into account comparison level. This involves the expectation of the kinds of outcomes a person expects to receive in a relationship. These expectations are