Spiral Lifecycle Increment Modeling for New Hybrid Processes

  • Raymond Madachy
  • Barry Boehm
  • Jo Ann Lane
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3966)


The spiral lifecycle is being extended to address new challenges for Software-Intensive Systems of Systems (SISOS), such as coping with rapid change while simultaneously assuring high dependability. A hybrid plan-driven and agile process has been outlined to address these conflicting challenges with the need to rapidly field incremental capabilities. A system dynamics model has been developed to assess the incremental hybrid process and support project decision-making. It estimates cost and schedule for multiple increments of a hybrid process that uses three specialized teams. It considers changes due to external volatility and feedback from user-driven change requests, and dynamically re-estimates and allocates resources in response to the volatility. Deferral policies and team sizes can be experimented with, and it includes tradeoff functions between cost and the timing of changes within and across increments, length of deferral delays, and others. Both the hybrid process and simulation model are being evolved on a very large scale incremental project and other potential pilots.


System Dynamic Model Hybrid Process Team Size Spiral Model Change Impact Analysis 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Boehm, B., Brown, A.W., Basili, V., Turner, R.: Spiral Acquisition of Software-Intensive Systems of Systems. CrossTalk (May 2004)Google Scholar
  2. 2.
    Boehm, B.: Some Future Trends and Implications for Systems and Software Engineering Processes, USC-CSE-TR-2005-507 (2005)Google Scholar
  3. 3.
    Madachy, R.: Software Process Dynamics. IEEE Computer Society Press, Los Alamitos (2006)Google Scholar
  4. 4.
    Boehm, B., Turner, R.: Balancing Agility and Discipline. Addison Wesley, Reading (2003)Google Scholar
  5. 5.
    Boehm, B., Egyed, A., Kwan, J., Port, D., Shah, A., Madachy, R.: Using the WinWin Spiral Model: A Case Study. IEEE Computer (July 1998)Google Scholar
  6. 6.
    Boehm, B., Abts, C., Brown, A., Chulani, S., Clark, B., Horowitz, E., Madachy, R., Reifer, D., Steece, B.: Software Cost Estimation with COCOMO II. Prentice-Hall, Englewood Cliffs (2000)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Raymond Madachy
    • 1
  • Barry Boehm
    • 1
  • Jo Ann Lane
    • 1
  1. 1.University of Southern California Center for Software EngineeringLos AngelesUSA

Personalised recommendations