Objective: The aim of the present literature review is to identify and critically appraise the available evidence on the importance and effectiveness of addressing the ethno-culturally appropriate language needs of multicultural communities targeted by core public health services, within the broader concept of providing ethno- culturally competent public health programs. [...] The aim of the present literature review is to identify and critically appraise the available evidence on the importance and effectiveness of addressing the ethno-culturally appropriate language needs of multicultural communities targeted by core public health services, within the broader concept of providing ethno- culturally competent public health programs. [...] Even though the paper refers to the research settings, the conclusions can be extrapolated to the clinical settings as well: the interpreter’s competence and style can have an impact on the clinical encounter immediate or long-term outcomes, such as compliance with the recommendations and treatment, patient satisfaction and trust in medical services and provider. [...] The report summarizes the available data on the ethnic make-up of the national population and NHS workforce, and examines some of the health needs of different ethnic groups, and some of the different experiences of health services. [...] A Review of the Literature on the Health Beliefs, Health Status, and Use of Services in the Minority Ethnic Group Population, and of appropriate Health Care Interventions.