[en] The Tritium System Test Assembly (TSTA) project at Los Alamos National Laboratory is charged with developing and demonstrating the fusion fuel processing requirement for the magnetic fusion energy program. The key fusion fuel streams are the plasma exhaust and the blanket stream. At present, the technology under development at TSTA includes only the plasma exhaust. The blanket is a logical upgrade to TSTA. This possible upgrade is the subject of an ongoing study among LANL, JAERI, and Argonne National Laboratory (ANL). This program, called The Breeding Blanket Interface (BBI), is being investigated with the intention of installing such a processing system at TSTA in the 1992--1993 time frame. The BBI program was initiated in July 1987. The conditions of the tritium product streams of various blankets were determined. Pre-conceptual designs of the BBI systems were developed for two blanket concepts: Aqueous Lithium Salt Solution Blanket and Solid Breeder Blanket. Preliminary estimates of costing and the schedule of the TSTA/BBI program have been developed. This paper covers the schedule and planning of the TSTA/BBI program. The goal of the program is to establish the engineering data basis of the fuel cycle for an ITER type machine. The operation of the TSTA/BBI hardware is expected to cover the period of 1993 to 1996. 9 refs., 2 figs., 3 tabs