In the last decade, the study of the acquisition of tense and aspect among L2 (second language) learners has become a significant area of research. There is, however, one recurrent issue that has not yet been properly addressed, namely the relationship between research methodology and the acquisition of L2 tense-aspect. The current volume fills this void and provides new insights into the study of L2 tense-aspect by bringing together renowned scholars with experience in designing and carrying out research in L2 tense-aspect.