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The development of mathematically complete and consistent models solving theso-called "measurement problem", strongly renewed the interest of thescientific community for the foundations of quantum mechanics, among these theDynamical Reduction Models posses the unique characteristic to beexperimentally testable. In the first part of the paper an upper limit on thereduction rate parameter of such models will be obtained, based on the analysisof the X-ray spectrum emitted by an isolated slab of germanium and measured bythe IGEX experiment.  The second part of the paper is devoted to present the results of the VIP(Violation of the Pauli exclusion principle) experiment and to describe itsrecent upgrade. The VIP experiment established a limit on the probability thatthe Pauli Exclusion Principle (PEP) is violated by electrons, using the veryclean method of searching for PEP forbidden atomic transitions in copper.

Beyond quantum mechanics? Hunting the 'impossible' atoms (Pauli Exclusion Principle violation and spontaneous collapse of the wave function at test)