The work reported in this book is based on empirical data collected from three groups of speakers: native speakers of English and Persian and Persian speakers of English as an L2. The study addresses, among others, two of the most important aspects of L2 speech: 1) it provides an extensive sociolinguistic description of L2 by conducting multivariate analyses on features of English spoken by Persians to throw light on the issue of the systematicity of interlanguage, 2) it explores the relationship between native language of the speakers and their L2, on one hand, and the relation between the...