WEAVE-ECOS is an unoriented research project that integrates two senior researchers and their team in order to efficiently exploit the first science data from the new WEAVE spectrograph, which is in the commissioning phase at the William Herschel telescope (WHT), in La Palma (Canary Islands). This multidisciplinary project has been designed to address fundamental questions about the evolution and formation of galaxies and their constituents, stars, using WEAVE and additional data from public archives. In particular, we will investigate the role that the environment plays in the formation and evolution of stars and galaxies. To this end, several surveys have been designed and approved by the WEAVE consortium in order to carry out the scientific objectives of the Science Team. On the one hand, we will use data from the WEAVE Nearby Cluster Survey to analyze the properties of stellar populations in dwarf galaxies, the orbital structure of these galaxies in clusters and the impact of the environment on their structural components (disks and bars). On the other hand, we will mainly use data from the Galactic Archeology Survey and the Stellar, Circumstellar and Interstellar Physics Survey to characterize a statistically significant sample of stars, many of them with known disks and/or exoplanets as well as companions, in order to investigate the influence of environmental conditions on its properties. Finally, we will carry out data processing through the official pipeline of WEAVE, which we will improve with our results to get the most scientific return of the instrument during the exploitation phase.