For treating Alfven waves driven unstable by a particles, an alternati
ve to the Oak Ridge National Laboratory gyro-landau fluid approach is
suggested. Its primary advantage is that this method can simultaneousl
y treat fluid nonlinearities and kinetic quasilinear effects. It is ar
gued that more perturbative approaches could overestimate the kinetic
quasilinear effects. (C) 1995 American Institute of Physics.