Software evolution in practice for the U.S. Department of Energy. Experience report

The United States Department of Energy (DOE) maintains the nation´s supply of special nuclear material. Each year the DOE spends tens of millions of dollars safeguarding this material. As part of this defense program, the DOE has funded Lawrence Livermore National Laboratory (LLNL) to develop and evolve the Argus security system, which provides sophisticated access control and intrusion detection capabilities to some of the Department´s facilities. Changes in security and computer technologies impose continuous changes to system requirements. This paper examines the software engineering evolving-changing security system