Despite the increasing significance of written communication, there is limited research into spelling
therapy for adults with
acquired dysgraphia. Existing studies have typically measured spelling accuracy as an outcome, although speed may also be important for functional writing. As spelling is relatively slow, effortful and prone to errors in people with
dysgraphia, minimising errors within
therapy could be
a factor in
therapy success. This within-participant case-series study investigated whether errorless and errorful
therapies would differ in their effects on spelling speed and accuracy for four participants with
acquired dysgraphia. Matched sets of words were treated with errorless or errorful
therapy or left untreated. Results were collated one week and five weeks after
therapy. Both
therapy approaches were successful in improving spelling accuracy. For three participants, equivalent gains were demonstrated following errorless and errorful
therapy. One participant made significantly greater improvements in spelling accuracy following errorless
therapy. The effects were maintained five weeks later. There was no significant difference in post-
therapy spelling speed between the two
therapy conditions. The results of this study suggest that both errorful and errorless
therapies can be effective methods with which to treat spelling in adults with
acquired dysgraphia.