Adele Miccio recognized the paucity of information on the phonological development of children from diverse linguistic and cultural backgrounds, and emphasized the need to apply advances in bilingual phonological research toward an appropriate phonological measure for bilingual children. In the spirit of her pioneering work, the present study investigated both Mandarin and English phonological patterns in typically-developing 5-year-old bilingual children in an English-immersion programme in Taiwan. Consonant and vowel accuracy, number and types of phonological processes, and Mandarin-influenced English patterns were assessed on a single-word assessment in each language. Results indicated comparable levels of phoneme accuracy and similar rates and types of phonological processes for bilinguals and their monolingual counterparts. A number of English phonological processes for bilinguals, however, suggested a possible Mandarin influence. The present results reiterate Dr Miccio's call for interdisciplinary collaboration to enhance one's understanding of bilingual language development, to advance successful intervention for bilingual children. (Contains 1 note and 6 tables.)