  In models of spontaneously broken supersymmetry, certain light gravitino
processes are governed by the coupling of its Goldstino components. The rules
for constructing SUSY and gauge invariant actions involving the Goldstino
couplings to matter and gauge fields are presented. The explicit operator
construction is found to be at variance with some previously reported claims. A
phenomenological consequence arising from light gravitino interactions in
supernova is reexamined and scrutinized.
