[en] 1 - Description of problem or function: ANISN-W solves the one- dimensional Boltzmann transport equation for neutrons or gamma rays in slab, sphere or cylinder geometry. The source may be fixed, fission, or a subcritical combination of the two. Criticality search may be performed on any one of several parameters. Cross sections may be weighted using the space and energy dependent flux generated in solving the transport equation. 2 - Method of solution: The solution technique is an advanced discrete ordinates method which represents a generalization of the method originated by G.C. Wick and greatly developed to curvilinear geometry by B.G. Carlson at Los Alamos Scientific Laboratory. ANISN-W was designed to solve deep-penetration problems in which angle-dependent spectra are calculated in detail. The principal feature that makes it suitable for such problems is the use of a programming technique with optional data-storage configurations which allows execution of small, intermediate and extremely large problems. ANISN-W also includes a technique for handling general anisotropic scattering, point-wise convergence criteria, and alternate step function difference equations that effectively remove the oscillating flux distributions sometimes found in discrete ordinates solutions. 3 - Restrictions on the complexity of the problem: Problem size is limited only by machine size