The program aims at a comprehensive characterization of the dust and gas content of disks during the entire planet-forming phase. Building from Spitzer and ground-based detections of H₂O, OH, HCN, C₂H₂ and CO₂, we will search for less abundant/more complex molecules such as CH₄, C₆H₆, NH₃, HCO+ or HNC and rare isotopologues. A full inventory of molecules in the main planet forming region (inside ~10 au) provides important clues to the formation of even more complex molecules that eventually link back into the early history of our own Solar System, the origin and delivery of water on Earth, and, eventually, the emergence of life. In addition, we can follow the evolution of detailed dust mineralogy enabled by the unprecedented high S/N in the spectra.