In this dissertation I will explicate the sourcehood and leeway conditions, primarily by way of the concept of explanation. This yields three significant results. First, in clarifying the leeway condition, we find that it has two distinct ideas packed into it--one modal, one explanatory. These two ideas in fact correspond to two quite different versions of the control condition. Second, it turns out that the connection between the leeway condition and the sourcehood condition is far tighter than heretofore supposed. Though these are usually treated as clearly distinct and perhaps competing versions of the control condition, it turns out that they share a common core. Specifically, both involve what I call the explanatory condition, according to which you are only responsible for what you do if you are the explanation of it. That is, if you are the explanation in an unqualified sense.