During this program, Fiber Materials, Inc. (FMI) will develop practical methods for preparing Phenolic Impregnated Carbon Ablator (PICA) materials for joining thermal protection system segments and penetrations of the heat shield assembly. Current and future mission flight environments and designs, such as those for Mars Science Laboratory Aeroshell (MSLA) and anticipated for New Frontiers and Mars EDL missions, will be assessed. Capability of the developed solution(s) will address mechanical and thermal robustness, and performance under representative mission heating environment. The Phase 1 program evaluated candidate joining and gap-fill materials, and assessed joining design approaches for cost effective manufacturability and assembly. Material joining design, assembly methodology and material test performance was documented. The Phase 2 program will utilize materials developed during the Phase 1 program to test performance under representative environment(s). A down-selected material-joining approach will result in the design and fabrication of a mission-specific PICA sub-assembly. The prototype sub-assembly will demonstrate assembly methods and the prototype materials will be utilized for characterization and performance testing. The proposed materials, designs and methods are TRL <=3. It is anticipated that TRL=>6 will be achieved at the conclusion of a successful phase 2 program.