This work utilizes an empirical and theoretical approach to the study of linguistic phenomena, such as syllable structure, stress assignment, diphthongs, and phonological processing in Spanish. Based on data from L1 and L2 environments in Spanish language acquisition, these collected articles investigate examples of morphophonological interaction in native and non-native systems by identifying similarities and differences in comprehension and incorporation. Language change and language learning are examined extensively throughout in regards to difficulties intrinsic to the learner, the learning environment, and the utilization of the language in everyday life.