Studer, Thomas, Peter Lenz, and Monika Mettler. 2004. “Developing Instruments for the Assessment of Foreign-Language Proficiency (French/English): Goals, Context, Outcomes and Methodological Aspects of the IEF Project”. Swiss Journal of Educational Research 26 (3):419-34. https://doi.org/10.24452/sjer.26.3.4687.