The term vocabulary is used to represent the set of commands about which the user has knowledge and practical experience. In many cases only some of the commands known will be actually used: these are sometimes said to form a working set. No longer is an extensive, or even complete, knowledge of a command set considered the passport to good practice that it once was. On the other hand it tends to be believed the vocabulary of some learners will grow over a long period as they become skilled.
KeywordsZipf Distribution Fixed Sample Size Command Language Representational Change High Activity Rate
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