5a)     The document does not give a clear definition of the "usage  record", which leads to rather confusing statements such as "Record identity uniquely defines a record in the usage record" (page 6, definition of RecordIdentity).
Evaluation: Editor will add clarifying text

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Laura F. McGinnis, Project Coordinator
Data & Information Resource Services
Pittsburgh Supercomputing Center                         email: lfm@psc.edu
300 South Craig Street, #313                                 voice: 412-268-5642
Pittsburgh, PA  15213                                           fax: 412-268-8200
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