Key considerations for designing a user-friendly interface include:

1. **User Research:** Understand the target audience and their needs through research to inform design decisions.

2. **Simplicity:** Keep the interface simple and intuitive, minimizing unnecessary complexity for a seamless user experience.

3. **Consistency:** Maintain uniformity in design elements, layout, and interactions throughout the interface for clarity and predictability.

4. **Navigation:** Create clear and straightforward navigation paths, ensuring users can easily find and access the information or features they need.

5. **Visual Hierarchy:** Use design elements to establish a clear visual hierarchy, guiding users’ attention to the most important information or actions.

6. **Readability:** Prioritize legible typography, appropriate contrast, and consider accessibility standards to enhance readability for all users.

7. **Responsiveness:** Design for various devices and screen sizes to ensure a consistent and functional experience across desktop, tablet, and mobile.

8. **Feedback:** Provide users with immediate and informative feedback on their actions to enhance understanding and reduce uncertainty.

9. **Loading Times:** Optimize for fast loading times to prevent user frustration and improve overall satisfaction.

10. **Error Handling:** Implement user-friendly error messages and solutions, guiding users through issues rather than simply notifying them of errors.

11. **User Testing:** Conduct usability testing with actual users to gather feedback and identify areas for improvement in the design.

By considering these factors, designers can create interfaces that are not only visually appealing but also user-centric and effective in meeting the needs of their audience.