  We present a comprehensive theoretical study of low-energy few nucleon
scattering for systems with $A\leq 4$. To this end, we utilize pionless
effective field theory, which we employ at next-to-leading order. We show that
at this level the theory yields accurate predictions for the low-energy
scattering parameters in all studied channels. These predictions are on par
with the best experimental evaluations and the available theoretical
calculations. We confirm the recent observation that a four-body force is
needed at next-to-leading-order and find that for nuclear systems it only
appears in a single spin-isospin channel.
