Children with developmental disorder including children with Asperger disorder may make a lot of careless mistakes.
Although careless mistakes occur in various scenes, occurring of mistake is attributed to a weakness in working memory or error monitoring.
We have carried out support activity for a cooperator with Asperger disorder.
There were several careless mistakes such as a mistake of selecting operator and of simple calculation when the cooperator carried out several arithmetical problem expressed in words.
Then, we investigated factors bringing those careless mistakes and we found that the cooperator had a weakness in working memory and error monitoring during reasoning tasks.
Therefore we performed the training focused on the working memory and the error monitoring during reasoning tasks.
As a result of the training for approximately one month, the careless mistakes in simple calculation were reduced.