We present a next-to-leading order QCD analysis of the presently available
data on the spin structure function g(1) including the final data from the
Spin Muon Collaboration. We present results for the first moments of the pr
oton, deuteron, and neutron structure functions, and determine singlet and
nonsinglet parton distributions in two factorization schemes. We also test
the Bjorken sum rule and find agreement with the theoretical prediction at
the level of 10%. [S0556-2821(98)07117-3].