AO1

• Commitment to a relationship develops from three factors. The factor one is satisfaction. The extent to which both partners feel the rewards of the relationship exceeds the cost. Comparison with alternatives is the second factor. A judgment about whether a relationship with different partners would increase rewards and reduce costs. The third factor is investment. The resources associated with a romantic relationship would be lost if the relationship ended.
• There are two types of investment into a relationship. Intrinsic and extrinsic. Intrinsic investment is any resources put directly into a relationship. For example, money, energy and self-disclosure. Extrinsic is investments that previously did not feature in the relationship, were external to it, which are now closely associated with it. For example, a jointly purchased house, children or shared memories.
• Commitment to a relationship is determined by satisfaction and alternatives and investment. High levels of satisfaction, more rewards with the costs, and the alternatives are less attractive, and the sizes of their investment are increasing. Equals in a committed relationship from both partners.
• Commitment is the main factor that causes people to stay in relationships. Satisfaction contributes to this commitment. This explains why a dissatisfied partner stays in a relationship when their level of investment is high. They will be willing to work hard to repair problems in the relationship so their investment is not wasted.
• Committed partners use maintenance mechanisms to keep the relationship going. For example, promoting the relationship, putting their partner's interests first and forgiving them for any serious transgressions.