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Part II. Phased Implementation Plan for DMAC7.9.3.1. Number of “users” – The anonymous nature of much of the access prevents thetrue number of users from being collected. Unique Internet addresses are theclosest proxy to this number that can be collected, and are useful for evaluatingtrends as well as access by well-constrained domains such as .gov, .mil, .edu andinternational domains.7.9.3.2. Number of accesses – This is the number of files downloaded or otherwise accessedthrough the various services. Note that volume of data is not used here; acornerstone of DMAC data access is to provide subsets, GIS maps, online analyses- in short, only the information required by the user. The data access metricshall also be broken down by data set and service method.7.9.3.3. System performance statistics – This includes use of disks and computers as wellas work performed (i.e., services executed and volume accessed).7.9.3.4. In addition to numeric metrics, the AA shall provide for measurements of qualitativeaccess.7.9.3.4.1. Specifically, all archive systems shall have a means of soliciting andcapturing user feedback on services and data sets.76