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of how the Laboratory allocates its IR&D funds: Multilayer structures are efficient dispersive reflectors in the x-ray, soft x-ray, and extreme-ultraviolet spectral regions. We supported research in the fabrication of such thin-film structures and their use as effective "two-crystal" monochromators, multilayer diffraction gratings, multilayer zone plates, and Kirkpatrick-Baez x-ray microscopes. We will apply this technology to x-ray microscopy and materials-science studies of thin films. This project is described in detail beginning on page 17. We are supporting the development of a general purpose computational language called SISAL and the associated compiler techniques for writing programs to run on multiprocessor computer systems. SISAL is designed to be a programming language for the large-scale numerical computations typically written at LLNL. The results of this research are likely to significantly increase computational efficiency as parallel processors are more widely used at the Laboratory. This research is described beginning on page 26.

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