2. Agenda
3. SE and complexity
4. How SE has addressed complexity
5. Complexity Complex systems Simple systems Systems using systems engineering 6. Spectra-1...Which systems? Less ComplexMore ComplexClosed systems Open systems Clockwork systems Swarm systems Organized Self-organizing Weakly integrated systems Highly integrated systems Central control Decentralized control Single agents to pairs of agents Infinities of agents 7. Spectra -2...Characteristics Less ComplexMore ComplexUnderstandable Difficult to understand Predictable Unpredictable Equilibrium Chaos Linear Nonlinear Loose coupling Tight coupling Control Adaptability Strict hierarchies Networks 8. Spectra -3...Consequences Less ComplexMore ComplexStrict hierarchies Networks Simple behavior Strategic behavior Simple behavior Emergent behavior Clear cause and effect Unclear cause/effect Economy of scale available Economy of scale-killers Single scale Multi-scale Reductionism works Holism required 9. Theoretical types of complexity have have createdvia Dynamic complexity Development processes Things (Systems, products, things being engineered) Environment supports contains subtypes subtypes have has From current doctoral research Conclusion: Be clear which one you are talking about. Structural complexity Dynamic complexity: long term 5 Structural complexity: Size 1 Socio-political complexity 6 Dynamic complexity: short term 4 2 Structural complexity: Connectivity 3 Structural complexity: Architecture 10. Existing Measure for Type 6 (SocioPolitical)
Enterprise Systems Engineering Profiler TM of MITRE Source: Renee Stevens, Engineering Enterprise Systems: C hallenges and Prospects,Presentation to DAS XIII ,2006. 11. A process for getting to a Complexity measure
12. Use ESE Profiler, get a number What are you measuring the complexity of? x Weights Sum 3 2 2 2 1 3 5 30 20 25 5 15 15 60 40 50 5 45 215 Use Development processes Things (Systems, products, things being engineered) Environment 1 Traditional 2 Transitional 3Messy Frontier Estimate:Dynamic complexity: long term 5 Structural complexity: Size 1 Socio-political complexity 6 Dynamic complexity: short term 4 2 Structural complexity: Connectivity 3 Structural complexity: Architecture 13. Complexity in Program 3/31/09 14. Program Complexity Over Time 15. Caveats
16. Conclusion