  Scattering rates for a Goldreich-Sridhar (GS) spectrum of anisotropic,
incompressible, magnetohydrodynamic turbulence are calculated in the
quasilinear approximation. Because the small-scale fluctuations are constrained
to have wave vectors nearly perpendicular to the background magnetic field,
scattering is too weak to provide either the mean free paths commonly used in
Galactic cosmic-ray propagation models or the mean free paths required for
acceleration of cosmic rays at quasi-parallel shocks. Where strong pitch-angle
scattering occurs, it is due to fluctuations not described by the GS spectrum,
such as fluctuations generated by streaming cosmic rays.
