Product Description Phonology is the study of the changes that can affect a word, and sometimes even two words, for different reasons relating to a certain implied heaviness, like the existence of two identical letters or two letters that are close to each other or a hamza or a weak letter. The phonological changes are recognized as the assimilation of a letter to another, the substitution of a letter for another, the addition or elision of a letter or vowel and the transfer of a letter or vowel to another position. This study explores in detail when these changes are necessary, allowed or forbidden. The presentation of the rich data, the theoretical analyzes of the phonological elements and the references to the different works from the classical period of the 8th century until our days, offer a detailed and accessible study for both the students and researchers of Arabic. About the Author Joyce Akesson has studied the Semitic languages at Lund's University, Sweden, and has previously been a lecturer there during many years. Beside the present book, she is the author of "The Basics & Intricacies of Arabic Morphology" (Pallas Athena 2010), "The Phonological Changes due to the Hamza and Weak Consonant in Arabic" (Pallas Athena 2010), "A Study of the Assimilation and Substitution in Arabic" (Pallas Athena 2010), "The Essentials of the Class of the Strong Verb in Arabic" (Pallas Athena 2010), "The Complexity of the Irregular Verbal Nominal Forms & the Phonological Changes in Arabic" (Pallas Athena Distribution 2009), "Arabic Morphology and Phonology: Based on the Marah Al-Arwah by Ahmad B. Ali B. Masud" (Studies in Semitic Languages and Linguistics, Brill Academic Publishers 2001) and "Ahmad B. 'Ali B. Mas'Ud on Arabic Morphology Marah Al-Arwah: Part 1: The Strong Verb" (Studia Orientalia Ludensia, Vol 4, Brill Academic Pub 1990). She has also published several articles about Arabic linguistics in two Journals, the Journal of Arabic Linguistics (the ZAL or Zeitschrift fur Arabische Linguistik) Wiesbaden, and the previous Acta Orientalia, Denmark. She has also written a lemma about sarf "morphology/phonology in the Encyclopaedia of Arabic Language and Linguistics, vol. 4. Leiden: Brill, 20."