A&D - Introduction to Analysis & Design of Information System

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A&D - Introduction to Analysis & Design of Information System

  1. 1. Analysis & Design of Information SystemOrganized By: Vinay Arora Assistant Professor CSED, Thapar University www.slideshare.net/aroravinay
  2. 2. Disclaimer This is NOT A COPYRIGHT MATERIAL Content has been taken mainly from the following books:System Analysis and Design Methods By Jeffrey L Whitten & Lonnie D Bentley , Analysis & Design of Information Systems By James A. Senn, System Analysis & Design By Elias M. Awad,Modern System Analysis & Design By Jeffrey A. Hoffer, Joey F.George & Joseph S. Valacich Vinay Arora CSED
  3. 3. ADofInfoSys System – Set of Components that Interact to accomplish some purpose. Information System – Means by which data flow from one person or department to another. System’s Type – Open and Closed. Element of Control. Standards for Systems – Acceptable Level of Performance. Impact of Information System on Information Economy: Smart Working, Information taking precedence. System Analysis & Design – Process of Examining a Business situation with the intent of improving it through better procedures & methods. Vinay Arora CSED
  4. 4. ADofInfoSys System Study - Activity that Precede all other Analysis activities. System Analysis – Process of Gathering & Interpreting Facts, Diagnosing Problems and Using information to recommend Improvements to the System. To Proceed – One must understand the working of Existing system and Flow of Information. Analysis Specifies – What the System should do. System Design – Process of Planning a new approach OR one to replace OR complement an existing system. Design Specifies – How to Accomplish the Objective. Vinay Arora CSED
  5. 5. System Analyst Vinay Arora CSED
  6. 6. ADofInfoSys System Analyst – Complete System Study, Understanding Details of situation and deciding whether improvements are desired or not, All in the light of Business. System Analyst – System Analysis + Design + Programming. End User’s Categories: Hands-on, Indirect, User Management, Senior Management. Categories of Information System: TPS, MIS, DSS. Vinay Arora CSED
  7. 7. TPS Re St PL on cu isi rri ec ng nD Inf ei o Mgmt Control rm tur ati uc o S tr nN ee Operation Control d TPS Operations Vinay Arora CSED
  8. 8. ADofInfoSys Approaches to the Development of Computer Information System: # System Development Life Cycle Method. # Structured Analysis Development Method. # Systems Prototype Method. Vinay Arora CSED
  9. 9. Vinay Arora CSED
  10. 10. Start to End Vinay Arora CSED
  11. 11. System Development Life Cycle Method Preliminary Investigation – Request Clarification, Feasibility Study and Request Approval. Determination of System Requirements – Detailed Investigation. Design of System. Development of Software. Systems Testing. Implementation. Evaluation – Operational Evaluation, Organizational Impact, User Manager Assessment, Development Performance. Vinay Arora CSED
  12. 12. SDLC Vinay Arora CSED
  13. 13. Determination of System Requirements What is being done? How is it being done? How frequently does it occur? How great is the volume of transactions or decisions? How well is the task being performed? Does a Problem exist? If a problem exists, how serious is it? If a problem exists, what is the underlying cause? Vinay Arora CSED
  14. 14. Structured Analysis Development Method Structured Analysis – What the System has to do? Elements of Structured Analysis – Graphic Description, Data Flow Diagrams, Data Dictionary Systems Prototype Method: Defining Prototype. When to use Prototype – No System already present as proposed one, Partial Features are known, Requirements not known fully, Evolving Alternate versions. Prototyping Process – Identify the user’s known info., requirements, Develop working prototype, Use this model, Note changes required, Revise Prototype, Repeat steps. Vinay Arora CSED
  15. 15. Structured Analysis Vinay Arora CSED
  16. 16. Prototype Systems Prototype Method Defining Prototype - A Prototype is an original type, form, or instance of something serving as a typical example, basis, or standard for other things of the same category. When to use Prototype – No System already present as proposed one, Partial Features are known, Requirements not known fully, Evolving Alternate versions. Prototyping Process – Identify the user’s known info., requirements, Develop working prototype, Use this model, Note changes required, Revise Prototype, Repeat steps. Vinay Arora CSED
  17. 17. Advantages of prototyping May provide the Proof of concept necessary to attract funding Early visibility of the prototype gives users an idea of what the final system looks like Encourages active participation among users and producer Enables a higher output for user Cost effective (Development costs reduced) Increases system development speed Assists to identify any problems in earlier design, requirements analysis and coding activities Various aspects can be tested and quicker feedback can be got from the user Vinay Arora CSED
  18. 18. TECHNICAL Feasibility TECHNICAL Feasibility: Can the work for the Project be done with current equipments, existing software technology, and available personnel? If new technology is required, what is the likelihood that it can be developed? Vinay Arora CSED
  19. 19. ECONOMIC Feasibility ECONOMIC Feasibility: Are there sufficient benefits in creating the system to make the cost acceptable? Are the costs of NOT creating the system so great that the project must be undertaken? Vinay Arora CSED
  20. 20. OPERATIONAL Feasibility OPERATIONAL Feasibility: Will the system be used if it is developed and implemented? Will there be resistance from users that will undermine the possible application benefits? Vinay Arora CSED
  21. 21. Evaluation Evaluation is performed to evaluate the STRENGTH & WEAKNESSES of a SYSTEM. Dimensions for Evaluation: # Operational Evaluation # Organizational Impact # User Manager Assessment Vinay Arora CSED
  22. 22. OPERATIONAL Evaluation Ease of USE. Response Time. Suitability of Information Formats. Overall Reliability. Level Of Utilization. Vinay Arora CSED
  23. 23. ORGANIZATIONAL Impact Benefits to Organization (Cost, Revenue and Profit). Operational Efficiency . Competitive Impact. Vinay Arora CSED
  24. 24. Reference List1. System Analysis and Design Methods By Jeffrey L Whitten & Lonnie D Bentley2. Analysis & Design of Information Systems By James A. Senn3. System Analysis & Design By Elias M. Awad4. Modern System Analysis & Design By Jeffrey A. Hoffer, Joey F.George & Joseph S. Valacich etc……. Vinay Arora CSED
  25. 25. Thnx… Vinay Arora CSED

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