1. TU Delft offers most of its bachelor's programs in Dutch and all of its master's programs in English due to the large number of international students. 2. For open courseware, TU Delft uses the original language that courses are taught in, which is mostly Dutch for bachelor's and English for master's programs and MOOCs. 3. Some MOOCs offered in other languages have subtitles or are entirely translated into those languages to increase their global reach, such as a solar energy MOOC offered in Arabic and Japanese.