One of the objectives of the Foundation's Indoor Environment (IE) program is to establish a multi-disciplinary network of researchers and practitioners that will build the community and organize specialized workshops, annual meetings of grantees, and a capstone event. This grant will fund noted evolutionary biologist Jonathan Eisen and colleagues at the University of California, in collaboration with Hal Levin, a prominent building sciences expert, in their efforts to create the microbiomes of Built Environments network (microBEnet). The team plans to make use of diverse web-based, web-enabled, and in-person strategies to build a vibrant online and real community. Over the next three years, microBEnet will conduct activities in three areas: among existing Foundation grantees, with researchers in related disciplines, and with a broader public and scientific community. Among current Sloan grantees, the network will organize annual meetings and develop a wiki for communication. With researchers in related disciplines, microBEnet will organize special sessions at high profile meetings, and develop web communication resources.