a technique used to evaluate a product by testing it on users. This can be seen as an irreplaceable usability practice, since it gives direct input on how real users use the system.

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Are there any formulas or algorithm to evaluate playability of games from user's side?

I'd like to know what the title says. Basically, everything I have found deals with heuristics from developer's side, from device's side and the economical side of gaming development. However, couldn'...
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What are the metrics for measuring security and cognitive load as attributes of usability?

I want to know the standard metric one can use to measure security and cognitive load as attributes of usability in Mobile E-Commerce site application. The explanation should be base on users' ...