Hume asked the question how can one move from an 'is' to an 'ought' in his book, A Treatise on Human Nature:
In every system of morality, which I have hitherto met with, I have always remarked, that the author proceeds for some time in the ordinary ways of reasoning, and establishes the being of a God, or makes observations concerning human affairs; when all of a sudden I am surprised to find, that instead of the usual copulations of propositions, is, and is not, I meet with no proposition that is not connected with an ought, or an ought not.
Now, Kant acknowledges that Hume awoke him from his dogmatic slumber. He is also famous for his Categorical Imperative using which he places morality on a rational basis.
How does his Categorical Imperative tackle the Is-Ought problem? Or, does he simply side-step the whole issue?