1 / 11

Evolution of Software Systems Development: Challenges and Opportunities

Explore the historical progression of systems development, highlighting the need for a new approach to tackle backlogs, maintenance issues, and the benefits of object-oriented systems. Discover the costs involved in transitioning to modern software development practices.

barbarajgraham
Download Presentation

Evolution of Software Systems Development: Challenges and Opportunities

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 2Systems Development and The Software Crisis

  2. Chapter 2 Systems Dev. & the S/W Crisis Brief History Need for a New Approach Costs and Benefits of Objects

  3. Brief History • 1950s and 1960s, Systems Analysis was unstructured, unorganized • It was not done well. • Over the last 30 years there have been many improvements • But software still has just as many bugs! • But back then a large project was a few thousand lines of code • Nowadays largemeans several millionlines of code.

  4. Brief History Maintenance changes have always been a problem.

  5. Brief History • Backlogs • At any time there has been about a 5-year backlog • Plus there has also been a 5-year invisiblebacklog. • This has had two effects: • A move to end-user computing • A constant search for better ways to develop software systems.

  6. Brief History • Reliability • What caused all the maintenance and backlogs? • Poor initial design led to problems of • Flexibility, the ability of a system to handle unforeseen events or transactions • Resilience, the ability to handle changes during maintenance without other problems happening with every little change.

  7. Need for a New Approach to Systems Development • Many business managers do not realize how complex software development can be • Many use amateurs and hackers • Others hire out-of-date “professionals” • There are good ways and bad ways to do it • Good consultants are expensive • Because that’s what they are worth in ROI (Return on Investment)

  8. “The Dead COBOL Programmers’ Society.”

  9. Costs and Benefits of Objects Benefits of Objects: • System Stability • Maintainability • Reusable software components • Reality-based systems • Data accessibility • User involvement and ownership

  10. Costs and Benefits of Objects Costs of Objects: • Installed software base • COBOL • Legacy Systems: Out-of-date systems that already exist and must continue to exist for the foreseeable future. • Retraining • Not just a new language, but • A whole new way of thinking • Need a carefully-planned conversion • See Chapter 15, “Moving to O-O Techniques”

  11. End of Chapter 2

More Related