Experimental testing and computational modeling of gradient phonotactic well-formedness Investigating the organization of paradigms: which forms are "based on" other forms? How do people learn this? How can it be modeled computationally? Testing the "psychological reality" of productive and non-productive morphological processes by means of "Wug Testing" native speakers with novel words Understanding paradigm gaps: cases where speakers are unable to form any acceptable inflected form of a word Collaboration with Bruce Hayes on computational modeling of phonological and morphological acquisition in the face of exceptions. Computational modeling of historical change, as a way to probe the role of synchronic vs. diachronic forces in shaping phonology