This research aims to create an MECE (Mutually Exclusive, Collectively Exhaustive) categorisation method for typing errors. The research is grounded in theory by gathering typing error types found in both HCI and psychology literature. Empirical studies gathering typing errors from children are used to validate these error types. It is hoped that at a later date, this categorisation method can be used to detect dyslexia in children by inspecting their typing errors. Categories and Subject Descriptors H.5.2 [Information Interfaces and Presentation]: User Interfaces