This study examined the components of a one-on-one literacy tutoring model to identify the necessary and sufficient elements for helping struggling beginning readers. The tutoring components of interest included word work using manipulative letters, written word work, and a generalization component. Reading assessment data from 100 first-grade students, randomly assigned to four tutoring conditions and a control group, were analyzed. Following the treatment period, groups were evaluated on phonological awareness, sight word knowledge, decoding, and word attack. Results indicated that children who received all of the tutoring components performed better than those in the control condition across all four reading performance indicators under consideration. (Contains 5 tables.)