Moral praise and moral performance

According to some, luck forms an inevitable part of admirable moral agency. According to others, it is incompatible with a basic principle of moral worth. What's the issue? Is there a ‘problem’ of moral luck; or are there many, or none? With reference to the practice of moral praise, I suggest that there is no single problem of moral luck as traditionally understood. Instead, there is a family of issues regarding the interpretation and assessment of moral performance. In the background is a mixture of descriptive and normative issues, including how to understand the legitimacy of social expectations, the value of effort, and the duties of communities to enable their members to live good and virtuous lives.