Is constructivist psychology still relevant? Was it ever? Is it merely an obtuse cluster of theories bogged down in obscure epistemological debates of little to no relevance for most people? Why is it that constructivism is so often referenced in the clinical literature, yet organizationally it counts only a small number of people among its identifiable adherents and struggles to sustain itself as a coherent movement within the field? This volume takes up these issues by having prominent constructivist theorists put aside the usual topics of their scholarship and instead directly grapple with the very questions posed above. Borrowing the language of radical constructivism, the resulting contributions are intended to "perturb" the status quo and get constructivists and non-constructivists alike thinking about constructivism's past, future, strengths, weaknesses, and overall utility.