A study of the phonological development of a family of L2 English learners. It analyses data from actual language learners to examine the developmental processes involved in acquiring a nonnative sound system. It focuses on a tightly-knit group of learners' acquisition of phonology over a longitudinal timeframe. "Greater reliability is needed, however, to solidify these findings and enhance their generalizability. Two learners are bound to differ to some extent (and here they do in terms of accuracy for a number of feature types); thus, real evidence for universal variation patterns cannot be expected. A follow-up study could pull in larger numbers of Vietnamese participants, possibly comparing their data with those from other first-language groups, particularly languages typologically close to English, to potentially tease apart markedness effects from other patterns of interlanguage performance." -Alene Moyer, MLJ Reviews, (Modern Language Journal), Vol. 92 No. 1, 2008