1. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 1 Systems Analysis and Design Alan Dennis, Barbara Haley Wixom, and Roberta Roth John Wiley & Sons, Inc. Slides by Candace S. Garrod Red Rocks Community College Modified by Yusuf Altunel To be presented in CSE 440 Systems Analysis and Design İKU Department of Computer Engineering

2. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 2 Moving into Design Chapter 8

3. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 3 Chapter Outline Transition from Requirements System Acquisition Strategy Custom development Packaged Software Outsourcing Influences on Acquisition Strategy Business need In-house experience Project skills Project management Time frame Selecting an Acquisiton Strategy

4. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 4 Key Definitions Design phase Decide how to build the system Convert business requirements into system requirements describing technical details of the building system

5. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 5 Transition from Requirement to Design Selecting a Design Strategy System Acquisition Strategy Developing an Alternative Matrix

6. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 6 Design Activities

7. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 7 Sytem Specification Outline

8. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 8 Classical Design Mistakes Reducing design time Do not jump directly to the coding Result: Missing important details Later means extra costs Feature creep Change to the project features Expect about %25 of change in requirements Silver bullet syndrome Tools cannot solve the problems alone Tools help to save maximum %25 of costs Switching tools in mid-project new tools rarely reduce the pain New tool requires learning effort New tools generally carry new bugs

9. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 9 Design Strategies Custom development build from scratch in-house Purchase software package and customize it Outsource the development to third party

10. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 10 Custom Development PROS Allows flexibility and creativity Consistent with existing technology and standards Builds technical skills and functional knowledge in-house CONS Requires significant time and effort May exacerbate existing backlogs May require missing skills Often costs more Often takes more calendar time Risk of project failure

11. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 11 Packaged Software Available for many common business needs Tested, proven; cost and time savings Rarely a perfect fit with business needs May allow for customization Manipulation of system parameters Changing way features work Synchronizing with other application interfaces May require workarounds

12. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 12 Systems Integration Building systems by combining packages, legacy systems, and custom pieces Integrating data is the key

13. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 13 Outsourcing Hiring an external vendor, developer, or service provider May reduce costs or add value Risks include possibly Losing confidential information Losing control over future development Losing learning opportunities

14. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 14 Outsourcing Guidelines

15. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 15 INFLUENCES ON THE ACQUISTION STRATEGY

16. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 16 Selecting a Design Strategy In deciding on the strategy to use consider the followings: Business need In-house experience Project skills Project management Time frame

17. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 17 Selecting a System Acquisition Strategy

18. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 18 SELECTING AN ACQUISITION STRATEGY

19. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 19 Developing an Alternative Matrix What tools and technologies are needed for a custom development project? What vendors make products that address the project needs? What service providers would be able to build the application if outsourced?

20. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 20 Developing an Alternative Matrix Combine several feasibility analyses into one matrix Include technical, budget, and organizational feasibilities Assign weights to indicate the relative importance of the criteria Assign scores to indicate how well the alternative meets the criteria

21. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 21 Developing an Alternative Matrix

22. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 22 Alternative Matrix for Shopping Cart

23. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 23 Summary Slide System Design Phase – transitioning from requirements to design Design all the elements of the system First Task – determine the system acquisition strategy Custom development Purchase software package Outsource Use Alternatives Matrix to structure the system acquisition decision

24. PowerPoint Presentation for Dennis, Wixom, & Roth Systems Analysis and Design, 3rd Edition Copyright 2006 © John Wiley & Sons, Inc. All rights reserved. 8 - 24 Copyright © 2006 John Wiley & Sons, Inc. All rights reserved. Reproduction or translation of this work beyond that permitted in Section 117 of the 1976 United States Copyright Act without the express written permission of the copyright owner is unlawful. Request for further information should be addressed to the Permissions Department, John Wiley & Sons, Inc. The purchaser may make back-up copies for his/her own use only and not for redistribution or resale. The Publisher assumes no responsibility for errors, omissions, or damages, caused by the use of these programs or from the use of the information contained herein.