Positive psychology is a new subfield in general psychology which developed under the influence of humanistic approach at the end of the 20th century. Its subject-matter concerns human well-being, its sources and sustainable growth. This type of psychology distinguishes six positive human features: knowledge and wisdom, courage, humanity, justice, temperance and transcendence. In foreign language learning in formal classroom conditions, which is different from learning other school subjects because it requires skill attainment, positive psychology, and its research methods could propose tools to more efficiently investigate determinants of differential success in the process of language acquisition.