In this paper, we argue that a complete understanding of language processing, in this case word-recognition processes, requires consideration both of multiple languages and of developmental processes. To illustrate these goals, we will summarize a 10-year research program exploring word-recognition processes in Korean adults and children. We describe the particular issue to which this research is directed (the relationship between print and the sound system of the language), and describe the characteristics of the Korean writing system that are relevant to this issue. We then outline our research examining the use of lexical and sublexical processes in recognizing Korean words. We use these studies to argue that cross-linguistic and developmental investigations may constrain models of language processes, and must be considered for a complete understanding of word-recognition and reading processes.