Additionally, a summarization of command categories and frequencies showed the most popular category was "command and control" where users adjust device settings, navigate through the results and answer yes/no style of questions. The next popular category was related to entertainment questions, followed by lifestyle and shopping. Furthermore, despite signing into a device, participants made sophisticated use of the spaces around their bodies, for example to represent and refer to people or things that were the topic of their questions. Another observation was the use of a question-mark sign at the beginning of yes or no questions, to call the attention of the device, while typically this sign more often used at the end of such questions. When it came to errors, such as the device not giving the result the users were looking for, most commonly users would simply ignore the error and proceed with a different command. A close second method was to repeat the command with the exact same wording and signing style, followed by rewording the command.