When a commercial pilot steps into the cockpit of an airplane, it has been serviced by a host of personnel and will be supported by many more from takeoff to landing. In more and more places, when an elementary school teacher steps into inquiry-centered science instruction, his or her materials have been carefully prepared by a team of experts, too. When planning a materials resource center (MRC), it's important to first establish an overall vision for materials support. Envisioning is the work of teams. Teachers, administrators, key community leaders, parents, and school support staff all ought to be involved. The key question to ask is, "What materials support would be provided for science teachers if we could do anything?" Answering this question and then grounding it in reality requires school leaders to understand what a functioning MRC can do and what teachers need.