This chapter argues for the use of a learner corpus in task-based teaching of Russian. First, the chapter provides the definitions of tasks and discusses texts in task-based teaching. Second, we elaborate on focused tasks in light of the principles of language awareness and introduce Data-Driven Learning (DDL). And finally, we describe the two types of focused tasks, namely structure-trapping tasks and DDL tasks, and explain how a learner corpus can be seen as a medium between the more traditional structure-trapping tasks and innovative DDL tasks.