PLECE is an open instrumental platform for the development and the study of materials under extreme conditions of pressure and temperature. The platform offers facilities coupling a wide range of pressures from a few MPa to a hundred GPa, with a wide range of temperatures from 10 to 2000 K. The coupling of extreme conditions with in situ measurements is our specialty: X-ray or neutron diffraction, spectroscopic techniques (Raman, EXAFS, inelastic scattering), magnetic measurements and electrical transport measurements. PLECE is an interdisciplinary platform whose equipment is spread over two sites (Lyon-Tech-La Doua and ENS-Lyon). Technical directors : Sylvie Le Floch (Institut Lumière Matière, CNRS-Université Lyon1) Hervé Cardon (Laboratoire de Géologie de Lyon, ENS Lyon-CNRS-Université Lyon1) Scientific directors : Alfonso San Miguel (Institut Lumière Matière, CNRS-Université Lyon1) Isabelle Daniel (Laboratoire de Géologie de Lyon, ENS