The problem addressed in this study was that second language learners have difficulties pronouncing some English consonants that are not part of their language. Such errors occur because of first-language interference. The purpose of this qualitative case study was to explore the perceived effectiveness of using minimal pair training to differentiate between the pronunciation of the voiced /v/ and the voiceless /f/ phonemes. The ability to reach pronunciation proficiency may consequently improve communication. This study was conducted over six weeks and included a purposive sample of seven participants from different Arab-speaking countries who share the same experiences and the same problem. Open-ended face-to-face interviews and observation were used for data collection to ensure the quality of the obtained data and get more detailed information. A thematic analysis was used to examine the data and resulted in six themes: (a) perceived weaknesses in proficiency and communication; (b) language ability was affected by a variety of causes; (c) perceived ability improved weak points as a result of the training; (d) practice and training increased perceived ability; (e) minimal pair training improved perceived pronunciation proficiency; (f) minimal pair training improved perceived communication skills. This study showed that minimal pair training improved pronunciation proficiency and perceived communication skills for most participants. The data proved that Arab learners developed more interaction and communication with English speakers because pronunciation training increased their confidence and decreased their speaking anxiety. The study may help improve teachers' effectiveness in teaching English pronunciation because it focused on the most common pronunciation mistakes that inhibit learners from being understood. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]