Principle theories, constructive theories, and explanation in modern physics

Clifton, Bub, and Halvorson’s paper, “Characterizing Quantum Theory in terms of Information-Theoretic Constraints” (2003) invokes the theoretical significance of principle theories in contrast with constructive theories. However, a more thorough discussion of the merits of principle theories and constructive theories is required to justify this approach towards quantum mechanics. Looking at Einstein’s original use of the distinction to characterize special relativity, this paper argues that it is best understood in terms of explanatory preferences. The distinction depends fundamentally on the kinds of scientific explanation the respective types of theories provide. This conceptual clarification can shed light on principle theory approaches to quantum mechanics by delineating both the specific strengths of principle theories and pinpointing the explanatory motivation guiding this strategy. The aim of this paper is to establish the broad philosophical justification for a principle theory approach to interpreting quantum mechanics.