  This paper introduces calibrated representations for affine Hecke algebras
and classifies and constructs all finite dimensional irreducible calibrated
representations. The primary technique is to provide indexing sets for
controlling the weight space structure of finite dimensional modules for the
affine Hecke algebra. Using these indexing sets we show that (1) irreducible
calibrated representations are indexed by skew local regions, (2) the dimension
of an irreducible calibrated representation is the number of chambers in the
local region, (3) each irreducible calibrated representation is constructed
explicitly by formulas which describe the action of the generators of the
affine Hecke algebra on a specific basis in the representation space. The
indexing sets for weight spaces are generalizations of standard Young tableaux
and the construction of the irreducible calibrated affine Hecke algebra modules
is a generalization of A. Young's seminormal construction of the irreducible
representations of the symmetric group. In this sense Young's construction has
been generalized to arbitrary Lie type.
