Definition(s):

“We define social inclusion as the degree to which there are similar social expectations and opportunities for single employees and those with families. Social inclusion occurs when formal and informal social events at work are perceived as equally appropriate for single childfree employees and employees with families” (Casper, Weltman, & Kwesiga, 2007, pp. 480-481).
“Equal work opportunities exist when opportunities (e.g., promotions, assignments) are provided without respect to family status. Need, equality, or equity-based rules can be used to allocate work opportunities” (Casper et al., 2007, p. 481).
“Equal access to benefits refers to the degree to which similar ability exists for single employees and those with families to use benefits” (Casper et al., 2007, p. 481).
“We define equal respect for nonwork life as the degree to which similar value is placed on nonwork roles of all employees” (Casper et al., 2007, p. 482).
“Equal work expectations refer to the degree to which there are similar work expectations for single employees and those with families” (Casper et al., 2007, p. 482).

Casper, W., Weltman, D., & Kwesiga, E. (2007). Beyond family-friendly: The construct and measurement of singles-friendly work cultures. Journal of Vocational Behavior, 70, 478-501.