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Usability Testing: Evaluating how easily learners can use a learning product or system, often involving observation of learners as they interact with the solution.
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User-Centered Design: A process to understand the interactions among people and the other elements of a system and then apply theory, principles, data, and other design methods to optimize human well-being and overall performance. It includes designing from the perspective of humans who will be interacting with implemented designs.
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User Experience (UX): The overall experience of a person using a product, focusing on ensuring learning technologies are user-friendly, intuitive, and engaging.