Consistency
-- support tools
The great Tempter of Perfection exhorts: ``Correct it here and now,
before it is to late.''
But, here the Guardian Angel of the Installed Base is really a frontman
for the hideous Devil of Eternal Compatibility with the Horrors of the Past,
whose nefarious influence is also visible in Computer Science.
\zline{ [Meyer90]}
slide: The problem of consistency