In North America, zebra mussel information, including sightings, monitoring, environmental concerns, and control activities, is shared through both formal and informal networks. Informal networks are maintained by contacts with both Corps and non-Corps personnel through professional organizations and Government committees. Formal networks include both the Zebra Mussel Information Clearinghouse and the USACE Zebra Mussel Research Program (ZMRP). The best information sharing has resulted from interdisciplinary cooperation involving (a) facility experts, (b) zebra mussel experts, and (c) control strategy experts.