  The possibility of incorporating a chiral fourth generation into a SUSY-GUT
is investigated. Precision fits to electroweak observables require us to
introduce light supersymmetric particles, with masses less than mZ. These
particles might also provide decay channels for fourth generation quarks of
mass ~ 100 GeV. We also require tan(beta) to lie in the range 1.50 <~ tan(beta)
<~ 1.75 and obtain an upper limit on the lightest Higgs boson mass in the MSSM4
of 152 GeV.
