During the establishment of wikis in the 2000s, global research began to emerge regarding their effectiveness in promoting second language acquisition. Some of this research focused on more specific areas such as systemic-functional linguistics, humanistic education, experiental learning, and psycholinguistics. For example, in 2009 Yu-Ching Chen performed a study to determine the overall effectiveness of wikis in an English as a second language class in Taiwan. Another example is a 2009 study by Greg Kessler in which pre-service, non-native English speaker teachers in a Mexican university were given the task to collaborate on a wiki, which served as the final product for one of their courses. In this study, emphasis was placed on the level of grammatical accuracy achieved by the students throughout the course of the task.