Final answer:
Membership in Beta Sigma Phi, an international women's organization, is strictly by invitation from current members.
Step-by-step explanation:
Membership in Beta Sigma Phi is by invitation only. Beta Sigma Phi is an international social, service, and cultural organization for women. Founded in 1931, it was initially created to provide women with a social outlet and to offer educational programs. Today, the organization still holds true to these principles but has extended its reach to encompass service initiatives as well. Joining this organization is considered prestigious, as it is not open to the general public and prospective members must be invited by current members to join. The process ensures that the ethos and values of Beta Sigma Phi are upheld by bringing in members who align with the organization's mission and purpose.