Description: This paper discusses examining errors in technical communication. Abstract: Usage error is a popular topic for technical communicators. However, its anecdotal discussions remain the best source of information on the errors that technical communicators might value over others. In this paper, the author reports the types and frequencies of errors found in 41 editing tests administered to prospective technical writers and editors. Results indicate that misspellings and faulty/missing capitalization were the most frequent and dispersed errors. Eight of the most frequent errors related to style; however, grammar punctuation errors remain the most dispersed. A larger dataset will better determine how technical communicators prioritize specific errors.