refer to the Lexical Integrity Principle as a given concept within the linguistics canon. While today they are generally distinct theories, the LIH is historically referred to interchangeably with the Lexicalist Hypothesis, making the origin of the Lexical Integrity Hypothesis as a concept distinct from the Lexicalist hypothesis difficult to pinpoint. However, Bruening (2008) attributes the Lexicalist hypothesis, of which the Lexical Integrity Hypothesis is a subset, to Chomsky (1970). Interaction between Syntax and Morphology: Theoretical Variations One of the biggest challenges to defining the Lexical Integrity Hypothesis is in identifying the domain that syntax governs, the domain that morphology governs, and how these two constructs interact. Questions to be entertained, for example, are what constitutes a word and the point in which lexical insertion merges with sentence-level operations. is frequently used as a foundation for many explorations of the Lexical Integrity Hypothesis. In this book, linguists Anna Maria Di Sciullo and Edwin S. Williams explore the concept of word atomicity, as well as the framing of syntax within the idea of a "sentence form" wherein sentences are skeletal placeholders of lexical items, such as listemes, which are lexical constituents that are stored in the lexicon as opposed to generated by rules. redefines Lexical Integrity Hypothesis as a principle that excludes two interactions between syntax and morphology: (i) having access to word-internal structure, and (ii) being able to manipulate parts of word-internal structure--where manipulation is the syntactic movement, or the splitting of a word-constituent. He asserts that for a lexical unit to be a word, the impossibility of such manipulation is a necessary requirement. This prohibition on movement may serve as a test to find out whether a morpheme sequence is a word, or a phrasal compound. Rochelle Lieber, a linguist at the University of New Hampshire and Sergio Scalise of the University of Bologna propose the idea of a Limited Access Principle in which there is no hard wall between the division of syntax and morphology. Rather, there is a figurative filter that permits some syntactic operations on lexical items. This is evidenced by the fact that languages permit syntactic structures to be "downgraded" to words in that syntactic phrases can be merged into lexical items over time. Professors Antonio Fábregas of the University of Tromsø, Elena Felíu Arquiola of the University of Jaén and Soledad Varela of the Autonomous University of Madrid use the concept of a Morphological