This book investigates the fundamental nature of physical quantities and the metaphysical conditions that render them quantitative. Author J. E. Wolff, a philosopher of science, challenges existing reductionist accounts by proposing a framework known as substantival structuralism. The text argues that quantitativeness is an irreducible property of attributes, which should be conceptualized as substantival structured spaces rather than mere relational properties.

Experts in the philosophy of science recognize this work as a rigorous contribution to the ontology of physical properties. Readers frequently note the technical density of the prose, which requires a strong background in analytic metaphysics to fully navigate.