The problem explored by this study is the nature of b-d confusion as it is exhibited by remedial and nonremedial readers at various elementary ages in the areas of letter identification, spelling, and reading. The purposes of Phase I of the study were to examine the progressive phase-out of b-d errors committed by samples of remedial and nonremedial readers and to explore certain factors that could be related to the problem. The object of Phase II was to describe subjects with extreme b-d reversal problems. Extreme b-d reversers were found to have been average or below on first-grade-readiness scores and significantly below grade-level placement in reading achievement. School marks were also generally low. As a whole, the extremes were predominantly right-handed and no sex bias was detected. When the extremes were compared to subjects above average in b-d responses, the extremes made significantly more errors on other letters, were able to read significantly fewer words, and required significantly more assistance in spelling. These groups significantly differed on position of b-d reversals in reading, but not in spelling, nor on the proportion of real words actually produced when reversals were made in reading. Reversal of b and d was not associated …