A speaker’s progress toward language fluency involves improvement at producing the language’s typical sounds, or phonemes. How accurately a speaker makes language-appropriate phonemes can affect both the intelligibility of their speech, as well as their perceived proficiency. Few studies have quantified these acoustic properties in more detail than subjective listener evaluations. This study aims to record audio data from both Native German Speakers, as well as German Language Learners at various stages of learning. Native Speakers will be recorded as they read German target sentences, which contain a collection of words that differ from each other in ways that are difficult for native English speakers to pronounce correctly. After being presented with a recording and written version of each target sentence, Carthage German students will read the same sentences, each three times. This data can then be used to analyze and compare the pronunciations of specific phonemes, which will further aid the development of software able to accurately measure various acoustic features of speech, making it possible to capture phonological progress in a quantitative, objective way. This technology could help language learners measure their progress and receive feedback about how they can improve. Recording language learners at different stages of experience and proficiency will help create a baseline of acoustic progress that will enable such measurements and feedback.