This study presents the first descriptive analysis of the structure of Sa'i:di, the variety of Egyptian Arabic spoken by the inhabitants of the Nile Valley between Cairo and Aswan. It is hoped that this study, designed to describe the phonemics, morphemics, and syntax of Sa'i:di, will contribute to dialect studies of the varieties of Arabic spoken in Egypt, and to comparative studies of Arabic dialects. Part I treats the phonemes, suprasegmentals, vocalic system, consonants, emphasis, phonotactics, and morphophonemic alternation. Part II treats morphemic segments, form classes, pronouns, pronominals, and particles. Part III deals with syntactic units, types of phrases, clauses and sentences, negation, and interrogation. A sample text in Sa'i:di concludes this section; an appendix on phonotactics concludes the volume. All Sa'i:di material appears in phonemic transcription rather than in Arabic script. (AMM)