We report on the experimental program with polarized electrons and polarized few-body systems at the internal target facility of the NIKHEF electron storage ring.With a polarized deuterium internal target, absolute measurements of unprecedented accuracy have been performed for the analyzing powers T 2 0 and T 2 2 in elastic electron-deuteron scattering at transferred four-momenta 1.1 < Q < 2.8 fm - 1 . Results for a first measurement of the tensor analyzing power in quasi-elastic scattering are also presented. These data provide new constraints for descriptions of the deuteron spin structure and for reaction mechanism effects.Quasi-elastic electron scattering from polarized 3 He may provide precise information on the S and the D-wave parts of the 3 He ground-state wave function, the neutron form factors, and the role of spin-dependent reaction mechanism effects. We have started an experimental program at NIKHEF where polarized 3 He and polarized electrons are used, in combination with large acceptance electron and hadron detectors. Data were taken for the transverse (A 0 y ) and longitudinal (A z ) asymmetries at Q ≃ 2 fm - 1 . We outline the performance of the target and detectors.