Two experiments conducted at the University of Texas at Austin are discussed in this paper. One experiment deals with the production of final syllable lengthening and stress in Spanish and English by native Spanish speakers learning English. The other experiment deals with judgments about the Spanish speakers' production of English by native English speakers. In the former experiment, duration and frequency are measured. From these measurements, final syllable lengthening and duration and frequency ratios between stressed and unstressed syllables are calculated. In the latter experiment, the Spanish speakers are ranked according to their overall English pronunciation ability as perceived by native English speakers. Explanations are given for the durational and frequency adjustments the subjects make from Spanish to English, and the implications of the experimental results for English training programs for Spanish speakers are discussed. (Author/PMP)