Keyboard-Based Protocol for Typing Algebraic Expressions

摘要

Writing mathematical contents on digital format is more common every day. The usual method is to use WYSIWYG (What You See Is What You Get) equation editors included in mainstream text editors. However, this method requires a good deal of interaction with formula templates and the use of a pointing device. While this type of equation editors is accessible to users without visual disabilities, they present barriers for users with visual disability (UWVDs). Keyboard-based equation editors should promote not only inclusion but also an acceptable performance for sighted and non-sighted users. In this article, we analyze the efficiency of the typing protocol of the Algebra Editor, an accessible keyboard-based equation editor prototype, with sighted users. Results suggest that the protocol allows typing approximately 60 characters per minute. We also analyze the type and frequency of errors made by participants and suggest improvements to the protocol, derived from the findings. These results can be used as a reference to compare the efficiency of the protocol with non-sighted users and with other equation editors in future studies.