Individual memebership in Tri Beta is through a chapter on the campus of a four-year accredited college or university.  There are now more than 380 chapters offering their members activities and experiences that enrich and extend but do not duplicate the primary requirements for the biology major.  The national constitution provides a framework for chapter activities, but each chapter is free to function in accordance with its own needs and school philosophy.  A national officer visits each prospective chapter as part of the application process.  Chapter programs typically include guest speakers, reports of research by members and department faculty, field trips, maintenance of collections, community service and social getherings.  A faculty adviser provides continuity and experience to the student members.