The Computer Science Laboratory for Mechanics and Engineering Sciences (LIMSI) is a multidisciplinary research laboratory that brings out the researchers from different disciplines of the Sciences of Engineers and Information Sciences and As well as the Sciences of the Living and the Human and Social Sciences. Administrative organization is that the LIMSI (UPR3251) is a unit of the CNRS which is attached primarily to the Institute of Information Sciences and their Interactions CNRS (INS2I) . Further it is also associated by agreement with the University Paris-Sud with which the ancient and close ties are maintained by the unit. University develops numerous collaborations with the laboratories and the research units associated with engineering schools.The LIMSI was created in 1972 under the impetus of Lucien Malavard to develop research in digital fluid mechanics, acoustics and signal processing. The spectrum of work carried out in the laboratory has gradually been extended, on the one hand, to the processing of speech and images, then to a growing number of themes relating to human-machine communication and, on the other, in thermal and energy. The research of the laboratory is organized according to 4 main scientific axes, corresponding to the activities of 9 research groups: Fluid mechanics is a historical theme, with recognized competences in the development of advanced numerical methods associated with experiments in academic configurations: the AERO and ETCM groups contribute to activities in high-performance numerical methods, quantification of uncertainties, characterization of Dynamics (instabilities, turbulence), flow control and multiphysical coupling (MHD); Energy and mass and heat transfers present fundamental activities in an applied context: the ETCM and TSF groups contribute to a better understanding of the transfer mechanisms in convection and radiation, in multiphasics, in oscillating fluids and at low temperatures And micro / nanoscopic scales. They are also interested in the analysis of systems related to the thermal of the habitat or the solar energy. Automatic language processing, spoken written and signed is another of the key themes of the laboratory: the TLP , ILES and AA groups contribute to a wide spectrum of activity from acoustic signal processing (voice recognition and synthesis) to Semantic modeling and precise information retrieval, audio indexing, machine translation, analysis of emotions and feelings, and the extraction of information. Research in human-machine interaction is interested in analyzing, understanding and modeling the interactions between humans and artificial systems in contexts and in a variety of ways: haptic, tangible, gestural, Group AMI , the CPU group focusing on the psychology of non-verbal and collective affective interactions in humans as well as on the design of human-machine interfaces involving them; The devices of virtual reality and augmented are finally mainly studied in the groups VENISE , AMI and AA . The transverse action VIDA brings together a wide range of Arts / Sciences research projects conducted in close partnership with artists, visual artists and designers. VIDA also has the mission of organizing events on these topics and feeding the upstream reflection on these subjects. Training in and through research is an important task of the laboratory. Its members are very active in doctoral and master programs. On average, 70 doctoral students prepare a thesis in the laboratory. More than 60 trainees of all levels are welcomed every year (Bachelor, Master 1 or 2, engineering school, IUT. LIMSI teacher-researchers and researchers are involved in several higher education institutions. They are mainly involved in the teaching of the University of Paris-Sud, Pierre and Marie Curie University CNAM , ENSIIE , the University of Paris Descartes , the INALCO. Masters of Computer Science, degree, MIAGE are the new masters of Paris-Saclay University intervened in LIMSI which offers specializations of research oriented.Several members of LIMSI members play vital roles in new departments, EDs, departments.The laboratory also counts 3 elected members of the Academic Council of the University of Paris Saclay.