Which principle is NOT typically considered a part of usability?

In the context of usability, the principles generally focus on how effectively and easily users can interact with a product or system. Efficiency, learnability, and memorability are all important aspects of usability.

Efficiency refers to how quickly users can perform tasks once they have learned the interface. Learnability indicates how easy it is for new users to achieve proficiency. Memorability is about how easily users can remember how to use the system after a period of not using it.

Complexity, on the other hand, does not align with the principles of usability because it often refers to the intricate nature of a system that may hinder user experience. Usability aims to simplify interactions, making them intuitive and straightforward for the user. Therefore, complexity is considered contrary to the fundamental goals of creating a user-friendly design, making it the correct answer in this context.