is a process where one person reveals personal information of a certain intimacy level, and the other person discloses information of the same level. It is two-way disclosure, or mutual disclosure. Disclosure reciprocity can induce positive and satisfactory feelings and drive forward relational development, because as mutual disclosure takes place between individuals, they might feel a sense of emotional equity. Disclosure reciprocity occurs when the openness of one person is reciprocated with the same degree of the openness from the other person. For instance, if someone was to bring up their experience with an intimate topic such as weight gain or having divorced parents, the person they are talking to could reciprocate by sharing their own experience. Self-disclosure being reciprocated is also a forming foundation for interpersonal relationships. If self-disclosure is not reciprocated in an interpersonal relationship, it moves the relationship to potentially face a stage of de-penetration or "slow deterioration" (West, 2018). This can happen in a few ways, such as oversharing and undersharing. Oversharing personal information can lead to the end of the relationship, as "[s]ome partners may be ill-equipped and underprepared to know someone so intimately" (West, 2018). Since self-disclosure depends on going back and forth, if one partner does not share in that, it leads to an imbalance in the relationship, and the bond will unlikely progress since the other partner only knows a certain amount. This also causes the partner who shares or discloses not wanting to disclose any further, hindering the interpersonal relationship's progress because "[t]he greater the depth, the more opportunity for a person to feel vulnerable" (West, 2018). Vulnerability leads the partner to believe that there can be an interpersonal relationship as it translates into trust for partners' relationship. Onion model SPT uses the onion model, which visualizes self-disclosure as a process of removing layers. The onion denotes various layers of personality. It is sometimes called the "onion theory" of personality. Three major factors influence self-revelation and begin the process of the onion theory: personal characteristics, reward/cost assessments, and the situational context. Stages Relationship development is not automatic, but occurs through the skills of partners in revealing or disclosing first their attitudes and later their personalities, inner character, and true selves. This is done in a reciprocal manner. The main factor that acts as a catalyst in the development of relationships is proper self disclosure. Altman and Taylor proposes that there are