But, of course, an English-language dictionary would be useless if you hadn't already been trained in the fundamentals of English. A fundamental understanding is a prerequisite for competent use of the tool. It's also helpful to have learned how to use a dictionary. Users must be able to locate desired information quickly through an established, predictable access path. In the case of a dictionary, the access path can be a book or software application.
Predictability means that a tool is user-friendly.
For example, the structure of a dictionary is simple and straightforward. Accuracy is the gatekeeper of credibility. Regarding a dictionary, accuracy and credibility are taken for granted a desired condition for any performance-support system. The accuracy and credibility of a dictionary result from the rigorous processes in creating, publishing, and updating it. An electronic version must be based on the same rigor.