The purpose of this essay is to see if billingualism is understood within literature, society and among students and faculty teachers. We took inspiration from theories on billingualism and brought it with us when we carried out interviews with two principals in separate schools and when we conducted our investigation, in the form of questionnaires, in one of the schools. The investigation involved teachers and students in ninth grade. The study is divided into three parts: a theoretical background of what billingualism is; a presentation of the interviews and answers from students and teachers and an analysis of the results that came from the interviews and questionnaires. Our conclusions are that billingualism has a positive influence on human development. Sweden has been considered to be a one-language country, but our study shows to the contrary, that Sweden is definitely a billingual and multicultural country.