Discuss four characteristics of a usable system

User-Friendly Interface: A usable system should have an interface that is easy to understand and navigate. This means that the user should be able to easily find what they are looking for without having to go through complicated processes. The design should be intuitive and not require a lot of training to use.

Efficiency: A usable system should allow users to perform tasks quickly and accurately. This means that the system should be designed in a way that minimizes the number of steps required to complete a task, and it should provide clear feedback to the user about the success or failure of their actions.

Reliability: A usable system should be reliable, meaning it should function correctly and consistently. Users should be able to trust that the system will not crash or lose their data. This also means that the system should be designed to handle errors gracefully, providing clear error messages and easy ways to recover.

Accessibility: A usable system should be accessible to all users, regardless of their abilities or disabilities. This means that the system should be designed with features like text-to-speech for visually impaired users, or easy-to-use controls for users with motor impairments. It should also be compatible with assistive technologies like screen readers or alternative input devices.