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4-ICM Tech Report USC-CSSE-2007-715



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Using the Incremental Commitment Model to Integrate System Acquisition Systems Engineering and Software Engineering Barry Boehm and Jo Ann Lane University of Southern California Center for Systems and Software Engineering One of the top recommendations to emerge from the October 2006 Deputy Under Secretary of Defense DUSD Acquisition Technology and Logistics AT L Defense Software Strategy Summit was to find ways of better integrating software engineering into the systems engineering and acquisition process Concurrently a National Research Council study was addressing the problem of better integrating human factors into the systems engineering and acquisition process This paper presents a model that emerged from these and related efforts that shows promise of improving these integrations This model called the Incremental Commitment Model ICM organizes systems engineering and acquisition processes in ways that better accommodate the different strengths and difficulties of hardware software and human factors engineering approaches It also provides points at which they can synchronize and stabilize and at which their risks of going forward can be better assessed and fitted into a risk driven stakeholder resource commitment process Introduction Many projects have difficulties in integrating their hardware software and human factors aspects This is basically due to differences between these aspects with respect to their underlying economics evolution patterns product subsetability ability to deliver usable partial initial operational capabilities user tailorability adaptability underlying science and testing considerations as summarized in Table 1 This paper begins by summarizing trends that have caused difficulties for current systems engineering and acquisition processes complex multi owner systems of systems SoS emergent requirements rapid change reused components high assurance of qualities and principles underlying the ICM that better address these trends stakeholder



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