In this paper I contrast two types of happiness: Aristotle's and Kant's. These types are very different. For Aristotle moral goodness is identical with happiness, while Kant thinks that their relation is causal.
There is good reason to think that Kant's view is our own, since there are striking similarities between Kant's concept of happiness and our present one. At any rate it is clear that we don't think happiness is identical with moral goodness.
But when we take a closer look at the difference between the two types, we see that it stems from their views of moral activity. In Kant's view, happiness is the object of the will or realization. But for Aristotle happiness is found in (or with) moral activities. And this difference seems to be very important in the analysis of happiness.