By 2050, the U.S. Census (2009) predicts that 60% of the student population will be from non-white backgrounds. However, schools currently include school counselors from predominantly white backgrounds and projected to continue to be the dominant culture within the school setting (Greene, 2019). It is evident that the current student demographics in public schools has shifted, which requires multicultural and social justice competent school counselors. Cross-cultural counseling relationships within the school setting are prevalent and ASCA (2016), acknowledges the requisite for multiculturally competent counselors. Schools within the United States have culturally and linguistically diverse student populations which face systemic inequities. School counselors are in the unique position to be culturally responsive to challenge issues associated with diversity within the school setting (Schell, 2021). Previous research instruments were limited in measuring multicultural or social justice competence at one time (Hays, 2019). However, the MSJCS allows school counseling practitioners to measure the constructs simultaneously. The MSJCS is a tool that can be utilized by school counseling practitioners and supervisors to assess their own competence. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]