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3.3 Testing in molecules and solids</A>
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<P>
<EM>Even if our PP looks good
(or not too bad) on paper based on the results of atomic calculations,
it is always a good idea to test it in simple molecular or solid-state
systems, for which all-electron data (i.e. calculations performed with
the same XC functional but without PP's, such as e.g. FLAPW, LMTO,
Quantum Chemistry calculations) is available. The comparison with
experiments is of course interesting, but the goal of PP's is (at least in principle) to
reproduce AE data, not to improve DFT.
</EM>
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