  We discuss the selection of fermion representations in technicolor models
with a view toward minimizing technicolor contributions to the precision
electroweak $S$ parameter. We present and analyze models that involve one
technifermion SU(2)$_L$ doublet with standard-model singlet technifermion
sectors that lead to walking behavior, which further reduces $S$. We also
consider models that have technifermions in higher-dimensional representations
and study embeddings in extended technicolor theories.
