The book outlines the scientific motivations and requirements for future instrumentation at the Very Large Telescope (VLT) and its interferometer (VLTI). It details the scientific questions that drive astronomical research and how new instruments can address them. The text explores the technological advancements needed to push the boundaries of observational astronomy, focusing on the capabilities and potential discoveries enabled by next-generation VLT/VLTI instruments.

This book serves as a foundational document for the astronomical community, outlining the scientific rationale behind proposed instrumentation for the VLT and VLTI. It is likely regarded as a key reference for researchers and instrument scientists involved in planning future telescope capabilities. The work provides a comprehensive overview of the scientific frontiers that these advanced instruments are expected to explore.