Course work investigating the Great Vowel Shift, a major phonological phenomenon during the late Middle English period (14th–17th centuries), examining its causes, mechanisms, and impact on modern English pronunciation and phonological structure. The study highlights the shift’s relevance for linguists, language educators, historical researchers, and language technology by explaining pronunciation irregularities and phonological evolution of English vowels. Includes detailed historical context, sociolinguistic factors, and phonetic environment influences on the vowel shifts, illustrating their lasting effects on the English language.