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Theories of relationship development try to explain how partnerships change over time. Such theories highlight the dynamic process of evolution across the life span of relationships. Stage models are one class of theories of relationship development. Stage models propose that relationship development occurs as a succession of discrete phases. This entry identifies core assumptions of stage theories, describes examples, and evaluates their strengths and weaknesses.

Assumptions of Stage Theories

One assumption of stage theories is that relationship progression is marked by a series of delineated phases that partners must negotiate over time. A stage is an idiosyncratic period in the life span of a relationship that is noticeably different from adjacent periods. According to stage theories, partners experience a unique constellation of thoughts, feelings, and behaviors in each phase. Stage theories seek to (a) identify the phases that occur across the trajectory of relationship development and (b) describe the defining attributes of each phase.

A related assumption is that relationship development is punctuated at irregular intervals by events that transform the nature of the partnership. Stage theories portray relationship progression as sporadic, abrupt, and revolutionary. They argue that relationship-transforming changes occur at irregular intervals. Although stage theories recognize that later phases are linked to previous ones, they do not require adjacent stages to resemble one another.

Major Stage Theories

Many stage theories exist in the literature. Although they are united by common assumptions, the theories differ in the number and nature of stages they identify. The following subsections summarize prominent stage theories in approximate chronological order of their origin.

Wheel Model of Love

The wheel model of love, advanced by Ira Reiss, describes four stages in romantic relationship formation. During the rapport stage, individuals establish understanding and common ground. Next, in the self-revelation stage, partners engage in self-disclosure to convey private information about themselves. This self-disclosure prompts the mutual dependency stage, during which partners provide important rewards for one another. The model asserts that couples who successfully negotiate the rapport, self-revelation, and mutual dependency phases enter the intimacy need fulfillment stage. This stage is when partners feel romantic love for each other. Thus, the wheel model uses a four-stage structure to depict how relationships progress from acquaintance to romantic love.

Filter Theory of Relationship Development

The filter theory of relationship development, constructed by Alan Kerckhoff and Keith Davis, argues that romantic couples must satisfy three filters en route to marriage. First, individuals appraise the extent to which potential partners possess desirable social characteristics, such as ethnic background, religious beliefs, and socio-economic status. The filter theory contends that people will form a relationship with a partner who meets or exceeds their standards. Couples encounter a second filter when they begin to embark on a relationship. People assess their similarity of attitudes and values at this stage. If partners conclude that their perspectives are enough alike, the need complementarity filter becomes salient. Individuals evaluate whether their partner is capable of fulfilling their long-term needs. Accordingly, the filter theory identifies social characteristics, attitude similarity, and complementary needs as filters that determine relationship progression.

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