This study conceptualized perceived trustworthiness of the individual, self‐disclosure to the individual, perceived trustworthiness of people in general, and disclosive tendencies to other people in general to be indicants of a broader construct of trust. Self‐disclosure and perceived trustworthiness of the individual were found to be related constructs assessing differential aspects of the trust construct. Likewise, self‐disclosure and perceived trustworthiness of the individual were found to be criterial attributes of interpersonal solidarity. These communication‐related phenomena indicated the solidarity of interpersonal relationships. In the progress of the research, a 20‐item measure of perceived interpersonal solidarity was developed as a criterion for assessing the impact of communication‐related variables on interpersonal relationships. Other exploratory research issues were i