An eight week study was independently conducted to assess the effectiveness of Duolingo as a language learning tool. The participants took one university placement Spanish language test at the beginning of the study and one at the end. The improvement of language abilities was measured as the difference between the initial and the final language test results.
The study estimated that a person with no knowledge of Spanish would need between 26 and 49 hours (or 34 hours on average) to cover the material for the first college semester of Spanish. Since a one semester university course usually takes more than 34 hours of work, this study suggests that Duolingo is more effective than university.
Edited by -Wade-, February 18, 2013 - 10:29 PM.