their UWG's concurrence on their annual work plans prior to submission. These plans are used by the ESDIS Project as input to the negotiation of budgets and work priorities.

In addition, UWG membership has been fairly stable, despite the investment in time required to participate in regular meetings. We conclude that the members feel that this activity is a reasonable investment of their time, either for ensuring that their own needs are met or that the wider communities' needs are met. With respect to the latter, UWGs make particular efforts to ensure that the group's composition represents a cross-section of the potential user community.

The other advisory groups advise as to EOSDIS capabilities, and, therefore, indirectly the DAACs, as the long-term institutional base for the EOSDIS. The coordination between these groups is mainly via NASA, with additional informal coordination by way of dual participation in the meetings of these advisory groups. Several of the DAAC UWG members are also members of the EOSDIS Data Panel which is responsible for advising the ESDIS Project in overall direction and priorities in serving the science community. In addition, DAAC Project scientists and DAAC Managers participate directly in the Data Panel meetings.

DAACs are kept informed of any advice Project receives from other science advisory groups such as ESSAAC [Earth System Science and Applications Advisory Committee], NRC Panels, ERG [EOSDIS Review Group].

2. System development.

Each DAAC is responsible for determining whether extensions to existing ECS system capabilities are necessary (Plan, section 3.1.2). Have the DAACs responded to ESDIS with proposals for system improvements or prototyping? Which of these have been incorporated into EOSDIS?

DAACs have suggested and been funded to perform system improvements and prototypes via both their annual work plans and more formal proposals to the ESDIS Prototyping Manager. The latter proposals are more directed at solutions for evolving ECS (and are reviewed by the EOSDIS Data Panel), while the former have been more directed towards building and improving V0 [Version 0].

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