Keller, Benjamin J.Nance, Richard E.Arthur, James D.2013-06-192013-06-191990http://hdl.handle.net/10919/19621Covering the Task 2 effort in the development of an AEGIS software maintenance methodology, the derivation of requirements from maintenance principles is summarized. Three models of the maintenance process provide the basis for identifying points of application. The mid-level (aggregate) model is the major focus of the methodology definition. Recommendations address the potential uses of different modeling perspectives, better balance between products and process assessment, use of metrics, and the selection of maintenance tools.application/pdfenIn CopyrightTechnical reportTR-90-43http://eprints.cs.vt.edu/archive/00000225/01/TR-90-43.pdf