Incorporating user feedback into GUI iterations is crucial for creating a user-friendly and effective interface. Here are some best methods:

1. Prioritize feedback: Focus on the most critical and recurring issues.

2. Categorize feedback: Group similar feedback to identify patterns.

3. Analyze and interpret: Understand the underlying reasons behind user feedback.

4. Create a feedback loop: Establish a continuous process for collecting and incorporating feedback.

5. Involve stakeholders: Share feedback with the development team, designers, and stakeholders.

6. Iterate and refine: Make targeted changes based on feedback and test again.

7. User testing: Validate changes with users to ensure improvements meet their needs.

8. Feedback tracking: Monitor and track feedback to ensure resolution and closure.

9. Communication: Keep users informed about changes and updates.

10. Continuous improvement: Embrace a culture of ongoing iteration and refinement.

Additionally, consider using tools like:

- Feedback management software

- Project management tools

- Version control systems

- User testing platforms

- Analytics tools

By incorporating these methods and tools, you'll effectively integrate user feedback into your GUI iterations, ensuring a user-centered design that meets users' needs and expectations.