This volume contains a detailed description of the ANCET Input Processor (AIP). This model is programmed in FORTRAN for a CDC 3600 computer with at least two 32,000 word banks of core. Sections I, II and III contain a general description of AIP and should be read by potential users of ANCET. The remainder of the volume contains detailed flow charts, definitions of parameters, and the FORTRAN listings. These sections are intended as a reference for readers who need to understand the datailed logic of the input processor.