\section{SUMMARY}
\label{sec-sum}
We have described some of the compelling physics program of Run~II 
and the upgrades to the D\O \ and CDF detectors necessary for their 
accomplishment.  Both collaborations have made substantial improvements 
to their respective detectors.

At the time the
Run~I detectors were designed, the physics landscape at the TeV scale was
fairly unknown, particularly with respect to the mass of the
then undiscovered top quark.  Today, we have recorded
dozens of top quark events, and from the discovery sample,
we know how to build a detector to study them when
thousands are produced.  Even unseen phenomena such
as $p\overline{p} \rightarrow W  H \rightarrow 
e  \nu  b  \overline{b}$ are sufficiently constrained
by theory to make the experimental sensitivity understood.
Also, several detector features are important for a 
wide variety of physics analysis: e.g. whether looking for
a large sample of top quarks, the so far unobserved Higgs boson
or to measure the oscillation parameters of the $B_s$
meson, efficient lepton and jet identification and $p_T$ measurement, and 
a powerful silicon detector are important.  In the
process of upgrading the detectors to maximize the 
capabilities of the detectors for particular physics
processes, both collaborations have built very general
devices, with a wide range of applicability.

It's not too surprising, then, that although both 
experiments still maintain their unique character, 
their Run~II configurations are more similar to 
each other than was their Run~I configurations.
D\O \ still emphasizes calorimetry and full 
rapidity acceptance, especially for lepton identification. 
CDF still emphasizes tracking in the central region.
But their similarities are increasing. Both experiments
have a major investment in central trackers, and this
is particularly true for silicon vertex detector.  Both
experiments have upgraded their lepton identification,
through improvements to their calorimeters and muon
detectors.  And finally, both experiments have 
enhanced the capacity of their triggers and data   
acquisition systems to handle data rates over an
order of magnitude above what was formerly available.
Such upgrades open up many aspects of new physics to
the collaborations, including precision top quark physics,
various aspects of the behavior of bottom hadrons,
increased likelihood of discovering the Higgs boson, 
and, best of all, the possibility of discovering something
completely new.

\vspace{.2in}
\noindent ACKNOWLEDGEMENTS
We thank the members of the CDF and D\O \ Collaborations for documentation
of the detector upgrades.  In particular we would like to thank Alice Bean,
Doug Glenzinski, Peter Van~Gemmeren, Stefan Gruenendahl, Mike Lindgren, 
Kevin Pitts, Maria Roco, and John Womersley for helpful discussions during 
the preparation of this review.

% could be a few more before we're done
