Relational Maintenance Theory (Canary & Stafford, 1992; Stafford, 2011; Stafford & Canary, 1991; Stafford, Dainton, & Haas, 2000) explains that there are seven maintenance behaviors (positivity, understanding, assurances, network, sharing tasks/activities, relationship talks, and self-disclosure) that are used to sustain various types of relationships. For friendships, though, start by focusing on these two maintenance behaviors: sharing tasks/activities and self-disclosure.