+ supportive study - Hass and Stafford found that out of couples who claimed to have high levels of intimacy, 57% exclaimed this was because of self-disclosure. this therefore supports the importance of self-disclosure in the success of relationships. plus, has practical application for the use of therapies which focus on increasing the depth and breadth of self-disclosure for couples who struggle with intimacy, as well as increasing trust within the relationship. These are the predictions made by social penetration theory, thus further increasing the validity of this theory