This document provides a summary of the research conducted in the Global Modeling and Simulation Branch and highlights the most significant accomplishments in 1986 to 1987. The Branch has been the focal point for global weather and climate prediction research in the Laboratory for Atmospheres through the retrieval and use of satellite data, the development of global models and data assimilation techniques, the simulation of future observing systems, and the performance of atmospheric diagnostic studies. Baker, Wayman (Editor) and Susskind, Joel (Editor) and Pfaendtner, James (Editor) and Randall, David (Editor) and Atlas, Robert (Editor) Goddard Space Flight Center...