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Understanding the System Development Life Cycle and Sustainability Cycle

The System Development Life Cycle (SDLC) is a structured approach to developing systems, encompassing phases such as analysis, design, development, deployment, maintenance, and decommissioning. This process ensures that each system meets its intended objectives with minimal unexpected outcomes. The Sustainability Cycle builds upon SDLC principles by incorporating periodic reviews to assure system relevance and effectiveness. It emphasizes re-designing parts of the system that do not meet desired outcomes, facilitating continuous improvement. Together, these cycles enhance the longevity and efficacy of systems in various contexts.

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Understanding the System Development Life Cycle and Sustainability Cycle

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  1. CS5493 SDLC

  2. SDLC • System Development Life Cycle

  3. SDLC • Simplified SDLC • Analysis (planning) • Design • Development • Deployment (implementation) • Maintenance (assessment) • Decommission

  4. SDLC • Analysis – • collect data and determine the needs for a new system. • Determine the objectives for the system

  5. SDLC • Design • Design a system that can be implemented taking into account • the required objectives, • desired outcomes, and • resources available

  6. SDLC • Deployment (implementation) • Don't let all that hard work go to waste! • Support from management • Budgeting/purchasing • Training • Publishing • etc

  7. SDLC • Maintenance (assessment) • Measure if the system meets the objectives • Must work as intended and produce the desired outcomes • There could be unexpected outcomes • Implement a Sustainability Cycle

  8. SDLC • Decommission • Your system may eventually become obsolete • Secure disposal of assets

  9. The Sustainability Cycle(loop)

  10. The Sustainability Cycle • Establishing a system in-perpetuum. • Analysis (planning) • Design • Development • Deployment (implement) • Maintenance

  11. Sustainability Cycle • What makes this different from SDLC?

  12. Sustainability Cycle • Analysis • Periodic review of the system (6-24 months) • To insure a proper review, someone must be held accountable for the review.

  13. Sustainability Cycle • re-Design • Those aspects of the original design that • do not produce the desired outcomes, or • produce unexpected negative results must be re-designed, replaced, decommissioned.

  14. Sustainability Cycle • Deployment • implement the changes

  15. Sustainability Cycle • Maintenance • Repeat the sustainability cycle

  16. SDLC • SDLC can be applied to physical systems, policies & procedures, computer security awareness program (or training), etc.

  17. Program, Policies, and Procedures • Implementing a p* has benefits and consequences. • A good p* is expected to produce desired outcomes. • A p* can have undesirable and unexpected consequences. • Use a sustainment cycle to keep it relevant. Periodically review the effectiveness of your p* and be prepared to make changes.

  18. Pragmatism • The effectiveness of a policy is dictated by its observable results. • The policy must work as intended and produce the intended outcome.

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