This book begins by distinguishing the difference between lexicology and lexicography, then presents the types of dictionaries in their various forms, functions, and sizes. Then it details the impact of different linguistic approaches in dictionary making, from historical, descriptive, structural, functional, contextual, distributive, and generative linguistics, on the various linguistic and lexical levels of phonetic, morphological, syntactic, and semantic, as well as in the arrangement of linguistic units that are subject to the approach followed in the dictionary.