How do you approach the iterative design process when developing complex products?

Hi All, I am Emmanuel Katto. I'm curious about how designers and engineers manage the challenges that come with refining and improving product designs over multiple iterations. What tools or methodologies do you use to gather feedback, test prototypes, and incorporate changes effectively? Do you have any specific examples where an iterative approach significantly enhanced the final product?

Looking forward to responses.

Thanks!
Emmanuel Katto