In recent decades, Moroccan Arabic, the Arabic dialect traditionally serving as a vehicle of informal oral communication in Morocco, has been increasingly often used by its native speakers in writing. Written Moroccan Arabic dominates electronic communication and has penetrated into the domains previously reserved for Standard Arabic: media, advertising and printed belles lettres. In these functions, it is primarily written in the Arabic script, to which this book is dedicated. Because, unlike Standard Arabic, Moroccan Arabic has no spelling standards (orthography), its users who write it down create and apply, quite inconsistently, their own individual spelling systems. The Moroccan Arabic graphic macrosystem which these make up is therefore unstable and permeated with variational heterography, consisting in a given phonetic word being represented by various graphic words, termed variational heterographs. The linguistic description of one of its types – qualitative variational heterography (the other types being linear and quantitative) – presented in this book is based on an extensive corpus of literary texts published in print in the years 1991-2012. By discussing an ample selection of pairs of heterographs illustrating variation between graphs (letters), the author shows which elements of written Moroccan Arabic are subject to qualitative variation, while by identifying general principles underlying particular spellings, he explains the reasons for this phenomenon. He also proposes a classification of graphs used in this graphic macrosystem into graphemes