 Such claims can be quite difficult to assess. Some important distinctions need to be drawn between theoretical and practical reasons to endorse pluralism, and even once this has been done it can be difficult to decide whether the view, over all, really possesses a virtue—it may depend on substantial empirical claims for which the evidence has yet to be gathered—whether or not it possesses a greater weight of virtues than rival theories (is not logical monism a simpler theory, and simplicity a theoretical virtue too?) and finally whether or not that is a good reason to believe the view. 