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External quality of a software product refers to the characteristics of the software that are visible to and measurable by the users of the software. It includes factors such as usability, performance, reliability, and security. Measuring and evaluating a software product's external quality is essential because these characteristics directly impact the user's satisfaction with the software and their ability to use it effectively.

Some examples of external quality characteristics that are important to measure and evaluate include:

  1. Usability refers to how easy it is for users to learn and use the software. A software product with high usability is intuitive and easy to navigate.

  2. Performance: This refers to how quickly and efficiently the software performs its intended tasks. A software product with good performance will run smoothly and respond quickly to user input.

  3. Reliability: This refers to how dependable the software is. A highly reliable software product will work consistently and predictably with few errors or crashes.

  4. Security refers to how well the software protects against threats such as viruses, hackers, and data breaches. A software product with suitable security measures will keep user data safe and secure.