What Is the Difference Between Leadership Development and Leadership Training?

I worked in a large organization for 15 years thati spent millions of dollars per year on leadership development, with seemingly no impact. How does this change the curriculum of howyou go about developing leaders? I think it's kind of the difference between developing people with kind of good intentions and hope, and developing people with a real sense of what is it that's going on. It strikes me that that is completely different than any of the leadership training i had.