The authors explored a new means of assessing responsiveness to decoding-skill intervention to model individual differences in the transfer of decoding-skill gains to other aspects of reading acquisition in 35 children, Grades 3 through 5, with reading disabilities. Seven different parameters, representing responsiveness to decoding instruction, were estimated for each child and used to predict gains on standardized reading tests assessing word attack, word identification, and text reading accuracy, fluency, and comprehension. Results indicated that several estimates of an individual's responsiveness to instruction were related to gains in other aspects of reading. Results also suggested that the most appropriate unit of analysis for examining transfer is the individual, not the group.