Is ability inherent or developed?

Carol Dweck through more than three decades of systematic research, has been figuring out answers to why some people achieve their potential while equally talented others don't—why some become Muhammad Ali and others Mike Tyson.
The key, she found, isn't ability; it's whether you look at ability as something inherent that needs to be demonstrated or as something that can be developed.
What's more, Dweck has shown that people can learn to adopt the latter belief and make dramatic strides in performance.