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Part II. Phased Implementation Plan for DMAC14. Activity: Improved efficiency for archive growth and access• Description: A concerted effort to implement DMAC Data Transport methods and Metadataand Data Discovery standards is required and will result in improved efficiency within the ArchiveSystem.• Milestone 1: Implement DMAC Data Transport receipt methods in parallel with extantmethods.- Task 1: Pilot and Pre-operational, critically compare data received for six months to a year.Assure all aspects of data integrity, track system performance, and problems.• Milestone 2: Implement DMAC Data Transport and Data Discovery in parallel with extantdelivery systems.- Task 1: Pilot and Pre-operational, offer data access through extant interfaces and procedures,and through DMAC Data Discovery interfaces and Data Transport protocols. Track alluser metrics, problems, and success. The pilot and pre-operational systems should run for atleast one year each.• Category: Pilot and pre-operational• Deliverables: Archive System tests of DMAC functionality.• Estimated Resources: Commensurate with Pilot and Pre-operational plans.• Sequencing: Following beta tests on DMAC Transport and development and testing ofMetadata and Data Discovery standards. Probably Year 2 and onward.15. Activity: Procedure to resolve data retention issues• Description: Data in archive systems are commonly resubmitted and replaced. The numberof old versions of data to be preserved remains an open question. Managers of data centers needa formal procedure to help them resolve this difficult issue.• Milestone 1: Reach a consensus agreement on how to resolve data retention issues and questionsfor data sets with multiple versions.- Task 1: Form a diverse expert team with representatives from archive management and thescientific user community.º Discuss and draft a set of procedures on data retention that possibly include:• An annual scientific review panel to consider data retention questions;• Input from IOOS management;• An adequately long public review period before any action is taken.- Category: Committee work (with IOOS policy implications)- Task 2: Develop schedule for removal of data sets identified for removal.º This should require approval from science, governances and parent agency.º This affects Data Discovery and Data Transport as they will need to make alterations toremove reference and support for that data.109