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This section provides the information necessary to determine the feasibility of
a proposed WFC observation. This section should be used in conjunction with
Chapter 5 
,which provides a technical description of the WFC and
its scientific performance, and § 7.8.4 which discusses the
expected
WFC background. Sections 12.2 and 12.3
discuss the count rate sensitivity and conversion of fluxes to count rates
for assumed source spectra. The capability of the WFC to make spectral
measurements using observations with different filters is outlined in
§ 12.4 , whilst in § 12.5 the WFC is compared
with the EXOSAT CMA instrument. Section 12.6 highlights the
potential problems of the UV leakage of some of the filters. Sections 12.7
and 12.8 discuss the capability of the WFC
to make variability studies, and for determining source positions (or
studying extended sources) respectively.