Abstract

William James’s A Pluralistic Universe was not very influential in his day; 100 years later, however, calls for a Jamesian-style pluralism are increasingly common in the natural and social sciences. We first summarize James’s critique of monism and his defense of pluralism. Next, we discuss similar critiques of monism and calls for “strong” pluralism across the natural and social sciences, even in traditional bastions of monism like physics, biology, and economics. We then argue that psychology is also in need of this pluralism, but the discipline is mired in uncritical, monistic assumptions, most notably operationism. We describe the problems this particular assumption presents, and also suggest some solutions we believe James would proffer, in the context of this monistic requirement