Iso - 9241-11 Standard Definition Of Usability

This definition is built on three core pillars that measure how well a system works for its intended audience: Effectiveness

The extent to which the user’s physical, cognitive, and emotional responses meet their needs and expectations. This covers comfort, acceptability, and how the user "feels" about the experience. Why the "Context of Use" Matters iso 9241-11 standard definition of usability

Time is the most common resource, but it is not the only one. Efficiency can also refer to mental effort, physical strain, or financial cost. This definition is built on three core pillars

The standard posits that usability is not a single metric, but a composite of three distinct outcome measures. A product is only considered "usable" if it balances all three. Efficiency can also refer to mental effort, physical

: The extent to which the user's physical, cognitive, and emotional responses resulting from use meet their needs and expectations. ISO - International Organization for Standardization Key Characteristics of the Standard