Four papers report on phonetic differences between Finnish and English, with pedagogical implications for teaching English as a second language. "The English /ptk/-/bdg/ Distinction: Data and Discussion" by Kari Suomi is a survey of recent work on the phonetic parameters of the fortis/lenis distinction. The distinction "voiced-voiceless" is preferred to "fortis-lenis." In "The Voiceless-Voiced Opposition of English Consonants: Difficulties of Pronunciation and Perception in Communication between Native and Finnish Speakers," Risto Hanninen analyzes the learning difficulties encountered by Finns in isolated words, in words included in word lists, and in words embedded in meaningful sentences. Learning difficulties vary greatly according to context. In voiced-voiceless identification tests, Finnish students failed to identify most of the tested oppositions. In "Vowel Reduction in the English of Finnish Learners" by Hannele Heikkinen, the quality of the final reduced vowel in English, when used by Finnish speakers, was found to be influenced by lip rounding reflective of Finnish "oe." Finally, in "The Discrimination and Identification of English Vowels, Consonants, Junctures and Sentence Stress by Finnish Comprehensive School Pupils," Reijo Lamminmaki deals with problems of language testing as related to identification problems, and questions the usefulness of existing tests in interlanguage research. (JB)