# First-principles calculations for the strong interactions?

Tom DeGrand

*Department of Physics, University of Colorado.
*

Particle physicists would like to understand how
bound states of quarks and gluons work, both for themselves and as
a part of the general problem of testing the Standard Model.
``Lattice QCD'' is a mix of analytic and numerical techniques
for studying these problems working directly from the Lagrangian.
I will give an overview of the field: why we do what we do,
a little bit about how we do it, and some stories about what we have
learned
(and what we have not learned) about the
strong interactions.