[en] The accuracy of an ANISN program and an internally developed Ssub(n) program CTHSN has been tested on some benchmark problems of neutron transport: 1) One group, critical, bare slab with isotropic and anisotropic scattering. 2) One group, multiplying, reflected slab with isotropic scattering. 3) One group, plane source in slab with isotropic and anisotropic scattering. 4) Two group, two and three medium slab problem. 5) One group, critical sphere and infinite cylinder with anisotropic scattering. In general it is found that the agreement between ANISN and CTHSN and between these programs and other calculation methods with similar accuracy is within 1 per mille or better. Exceptions occur closer than 1 mfp from a localized source in a slab and for problems with media of very different properties. (Auth.)