The nature of b/d confusion by remedial and nonremedial readers at ages seven, eight, nine, and ten was explored using pupils from ten schools in a large, metropolitan school district. Subjects were individually tested to assess reversal tendency in letter naming, word reading, and writing/spelling. Able subjects were also tested in sentence reading and in spelling and reading nonsense words. Data were presented to describe the developmental phase-out of b/d reversals from ages seven to ten. Remedial subjects committed significantly more b/d reversals than did nonremedials and did not show the same age phase-out. Meaningfulness and position were also found to influence reversals. Knowledge of right and left did not relate significantly to b/d reversals. 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. As a whole, the extremes were predominantly right-handed and no sex bias was detected. (Author/AA)