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Kasutuslikkus, also known as usability, refers to the degree to which a product, system, or service can be used by specific users to achieve particular goals effectively, efficiently, and with satisfaction. It encompasses the ease of use, user-friendliness, and overall user experience associated with interactions with the given technology or interface. A high level of kasutuslikkus indicates that users can accomplish tasks with minimal effort, errors, and frustration, leading to improved productivity and user satisfaction.

The concept of kasutuslikkus is integral to human-centered design and user experience (UX) engineering. It involves evaluating factors such as clarity of instructions, intuitiveness of navigation, accessibility for diverse user groups, and the overall logical flow of interactions. Usability testing methods often include user observations, surveys, and task completion measurements to identify areas for improvement.

Kasutuslikkus is important across various fields, including information technology, product development, web design, and industrial design. Ensuring good usability can lead to increased adoption of a system, reduced training costs, and higher customer loyalty. International standards, such as those established by the International Organization for Standardization (ISO 9241), provide guidelines and frameworks to measure and improve kasutuslikkus.

Overall, kasutuslikkus emphasizes making products and systems that are accessible, easy to learn, and pleasurable to use. By prioritizing user needs and feedback, designers and developers can create solutions that enhance how users interact with technology and promote more positive, effective experiences.