Bilingual speakers present a natural phenomenon called code switch (CS) when communicating, where bilinguals or multilinguals alternate their languages during discourse. However, code-switching between two languages does not mean children cannot differentiate between the languages. Rather, code-switching is considered a common aspect of bilingualism, and not only represents competency in the languages but also improves comprehension. Speech-language pathologists (SLPs) face challenges providing services for second language learners, and some SLPs believe they lack competency to access Culturally Linguistically Diverse clients due to unknown language, culture, limited access to interpreters for translations during assessment or even not having appropriate assessments. The purpose of this study was to examine SLPs knowledge of code-switching and to examine the reasoning behind different actions taken by SLPs when confronted with a code-switching client by using Azjen's (1991) Theory of Planned Behavior. Using a qualitative methodology and a phenomenological approach, interviews with seven speech language pathologists revealed positive outcomes towards the phenomenon of code-switching and negative attitudes towards the profession's and their colleagues' understanding of CS. Participants identified barriers that interfere with SLPs' decision-making due to a limited understanding of code-switching and diversity in the field. Participants expressed positive outcomes towards their self-efficacy, but a perceived lack of control over their diagnostic behavior due to lack of resources, training and diversity. [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://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]