 The second set of questions question is practical. Some hold that ambiguity aversion is not well-motivated by practical reasons and so we have no reason to account for it (Schoenfield 2020). Others hold that some particular decision rule associated with non-sharp probabilities leads to bad consequences, e.g., in virtue of running afoul of the principles mentioned in  section 1.2.3. Of particular interest is how these decision rules can be extended to sequential choice (Seidenfeld 1988a,b; Seidenfeld et al. 1990; Elga 2010; Bradley and Steele 2014; Chandler 2014; Moss 2015; Sud 2014; Rinard 2015).