One of the success of e-learning is the use of web usability of online learning is good. Usability in general is about the level of certainty which a product is easy to learn, effective, and fun to use from the user's perspective. In particular, the purpose usability is effective to use (effectiveness), efficient to use (efficiency), safe to use (safety), having good utility (utility), easy to learn (learnability), easy to remember how to use (memorability) [2]
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