Another question about freedom in the capability approach concerns whether, or the extent to which, it corresponds to other concepts of freedom within the philosophical literature, such as positive and negative freedom. While more research is needed in this regard, some scholars have argued that the concept of freedom in the capability approach most resembles the concept of freedom as non-domination within republicanism, albeit with some notable caveats and disagreement (Alexander 2010; List 2004; Pettit 2001; 2009; Sen 1983; 2001). 