The result of over twenty years of research, the Common European Framework of Reference for Languages: Learning, teaching, assessment (CEFR) is exactly what its title says it is: a framework of reference. It was designed to provide a transparent, coherent and comprehensive basis for the elaboration of language syllabuses and curriculum guidelines, the design of teaching and learning materials, and the assessment of foreign language proficiency.
On November 26, 1857, Swiss linguist and semiotician Ferdinand de Saussure was born. His ideas laid the foundation for many significant developments both in linguistics and semiotics in the 20th century. Moreover, de Saussure is widely considered one of the fathers of 20th-century linguistics and together with Charles Sanders Peirce one of two major fathers of semiotics.
A. Park, B. Beck, D. Fletche, P. Lam, and H. Tsang. 2016 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM), page 880-883. (August 2016)