Noam Chomsky's ideas and work on the human language faculty and how language is acquired opened new territory on which a whole new framework in non‐native language acquisition was established: generative second language acquisition, or GenSLA. Investigating Chomsky's principles and parameters within the GenSLA framework has brought additional and convincing evidence for the essential validity of Chomsky's original insights. This chapter highlights Chomsky's lasting legacy embodied in the GenSLA framework. In addition to interpretation, poverty of the stimulus situations provide an (...) opportunity to test Universal Grammar (UG)‐based knowledge of graded distinctions beyond simple acceptability. The Subjacency Condition was probably the most studied principle of UG in the 1980s and 1990s. Structure dependence is directly demonstrated in languages with auxiliary verb movement to form questions. The Feature Reassembly Hypothesis brought grammatical features reflected in functional categories to the front of GenSLA research. (shrink)