Second language acquisition (SLA) as a discipline has not had a long history and, as any new discipline, has seen growing pains over the years. This research timeline traces the development of the increased and more sophisticated use of statistics in SLA research and the increasing demands for rigor in their use. Use of statistical procedures has been increasing in the SLA literature, but the tools themselves have not developed from within the field; rather the increased use stems from greater statistical sophistication on the part of users. In other words, SLA is not an innovator but an increasingly knowledgeable borrower and adapter of statistical procedures.