2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/92189The new orthodoxy of quantum mechanics (QM) based on the decoherence approach requires many-worlds as an essential ingredient for logical consistency, and one may wonder what status to give to all these "other worlds". Here we advocate that it is possible to build a consistent approach to QM where no other worlds are needed, and where the quantum formalism appears as a consequence of requiring the enumerability of physical properties. Such a quantization hypothesis is closely related to indistinguishability, and is deeply inconsistent with classical physics.3 pages, no figure. To appear in the Proceedings of the conference "Foundations of Quantum Information" (April 2004, Camerino, Italy). In v2 some clarifications and references addedQuantum Physicstext