Goals: 1) Define the distinction between alternative cements and alternative supplementary cementitious materials; 2) Develop a more in-depth state-of-the-art report based on the ITG Final Report and Practitioners Guide; 3) Develop TechNotes on each individual AC technology; 4) Assemble additional case studies; serve as the clearinghouse for disseminating information on AC use worldwide; 5) Interface with the ACI Foundation, ASTM, RILEM, and other organizations to facilitate the development of necessary specifications and tests; 6) Develop a performance-based guide specification for ACs.