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   We propose three 20 ks observations of the bright Seyfert 1 galaxy NGC
   3783 that will support our upcoming AXAF grating spectroscopy and
   monitor variability of its strong Warm Absorber (WA). Grating
   spectroscopy of emission/absorption lines from the WA is expected to
   provide the best constraints yet on the geometry and dynamics of this
   gas, but emission line strengths will depend upon the history of the
   variable ionizing continuum. Two of our ASCA observations will
   determine this crucial luminosity/spectral history, and the third will
   let us unambiguously interpret our AXAF results relative to the
   extensive ASCA work on NGC 3783. ASCA observations will also study the
   response of WA edges to changes in the ionizing continuum, and they
   will monitor long-term WA variability.
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