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All
estimates
are
based
on
models
of
the
problem.
But
before
we
get
too
deeply
into
the
techniques
of
building
models,
we
have
to
mention
a
basic
estimating
trick
that
always
gives
good
answers:
ask
someone
who's
already
done
it.
Before
you
get
too
committed
to
model
building,
cast
around
for
someone
who's
been
in
a
similar
situation
in
the
past.
See
how
their
problem
got
solved.
It's
unlikely
you'll
ever
find
an
exact
match,
but
you'd
be
surprised
how
many
times
you
can
successfully
draw
on
others'
experiences.
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