1 / 53

Chap1: Intro to SAD

Chap1: Intro to SAD. Chapter Objectives. Discuss the impact of information technology on business strategy and success Define and describe an information system components Use profiles and models to understand business functions and operations

gitel
Télécharger la présentation

Chap1: Intro to SAD

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. Chap1: Intro to SAD

  2. Chapter Objectives • Discuss the impact of information technology on business strategy and success • Define and describe an information system components • Use profiles and models to understand business functions and operations • Explain how the Internet has affected business strategies and relationships • Identify various types of information systems and explain who uses them

  3. Chapter Objectives • Explain systems development tools, including modeling, prototyping, and CASE tools • Distinguish between structured analysis and object-oriented methodology • Describe the systems development life cycle • Discuss the role of the information technology department and the systems analysts who work there

  4. Introduction • The use of information • as a weapon in the battle • increase productivity, • deliver quality products and services, • maintain customer loyalty • make correct/strong decisions • IT can mean the difference between success and failure

  5. The Impact of Information Technology • Definition: Information Technology (IT) • Combination of hardware and software products and services that companies use to manage, access, communicate, and share information • A vital asset that must be • used effectively, • updated constantly • safeguarded carefully

  6. The Impact of Information Technology • The Future of IT • Accounted for almost 30 percent of economic growth in 2003 • Online population worldwide increased 106 percent between 2000-2004 • 305.5% usage growth 2000-2008 Note: http://www.internetworldstats.com/

  7. The Impact of Information Technology • The Role of Systems Analysis and Design • Definition: Systems Analysis and Design • Step-by-step process for developing high-quality information systems • Systems Analyst (SA) • Plan, develop, and maintain information systems

  8. The Impact of Information Technology • Who Develops Information Systems? • In-house applications • Software packages • Internet-based application services • Outsourcing • Custom solutions • Enterprise-wide software strategies • How versus What – how the system will be implemented before determining what the system is supposed to do = high risk

  9. Information System Components • A system is a set of related components that produces specific results • A mission-critical system is one that is vital to a company’s operations • Business cannot be done without it

  10. Information System Components • 1) Hardware – consist of everything in the physical layer of the information system • Servers, workstations, networks, telecommunications equipment, etc • 2) Software – program that control the h/ware and produce the desired result • System software – manage h/ware component (e.g. Win XP) • Network operating system – (e.g. Win 2003 Server, Unix, etc)

  11. Information System Components • Application software – consist of program that support day-to-day business functions • Enterprise applications – order process system, payroll system, financial system • Horizontal system – inventory or payroll application (e.g. standard payroll system that able to use by all companies) • Vertical system – design to meet unique req. of a business (e.g. special IS that serves to meet unique business req.)

  12. Information System Components • 3) Data • Is the raw material that an information system transforms into useful information • Tables • Linking

  13. Information System Components • 4) Processes • Define the tasks and business functions that users, managers, and IT staff members perform to achieve specific results • 5) People (Stakeholder) • Users, or end users, are the people who interact with an information system, both inside and outside the company

  14. Understanding The Business • Business Profile – describe company overall function • Organization, processes, services, products, customers, suppliers, competitors, constraints, future direction • SA investigates company’s products, services, Internet opportunities

  15. Understanding The Business • Business Models – purpose: make it easier for manager and system analyst to understand day-to-day business operation • Business models – a framework in creating value (e.g. selling computer – Dell) • Business process – specific (tasks|processes) that involved in creating value • BPR (business process reengineering) – trying to simplify current processes or reduce cost

  16. Understanding The Business

  17. Understanding The Business • New Kinds of Companies • Product-oriented – routers, microchips • Service-oriented – resellers and providers of information • Brick-and-mortar – conduct business from physical locations (have premises) • Dot-com (.com) or Internet-dependent • Amazon.com, Google, eBay, Yahoo!

  18. Impact of the Internet • E-Commerce (I-Commerce) • B2C (Business-to-Consumer) • B2B (Business-to-Business) • Electronic Data Interchange (EDI), XML, HTML • Web-Based Development Solutions • IBM WebSphere Modeler, Microsoft .NET • Web services • Developed by 3rd party developer but included as part of the IS

  19. How Business Uses InformationSystems • IT managers divided systems into categories based on the user group the system served • Office systems • Operational systems • Decision support systems • Executive information systems

  20. How Business Uses Information Systems (type of IS) • Today, it makes more sense to identify a system by its functions, rather than by users • Enterprise computing systems – support company-wide operation and data mgt req. • Transaction processing systems – data generated by day-to-day operations • Business support systems – provide job-related information to users at all levels of a company • Knowledge management systems – expert system, combine knowledge base and inference rule • User productivity systems – email, voice mail, fax, etc

  21. How Business Uses Information Systems (type of IS) • Enterprise computing systems • Support company-wide operations and data management requirements • Enterprise resource planning (ERP)

  22. How Business Uses Information Systems (type of IS) • Transaction processing systems (TPS) • Efficient because they process a set of transaction-related commands as a group rather than individually

  23. How Business Uses Information Systems (type of IS) • Business support systems • Provide job-related information to users at all levels of a company • Management information systems (MIS) • Radio frequency identification (RFID) • What-ifanalysis • e.g: What will happen if fuel price continues decreasing? Ads: FTMSK offers CS224 program which focus on Business Computing area.

  24. How Business Uses Information Systems (type of IS) • Knowledge management systems • Called expert systems • Simulate human reasoning by combining a knowledge base and inference rules • Many use fuzzy logic and neural network Ads: FTMSK offers CS223 program which focus on AI area.

  25. How Business Uses Information Systems (type of IS) • User productivity systems • Technology that improves productivity • Groupware • Information systems integration • Most large companies require systems that combine transaction processing, business support, knowledge management, and user productivity features • Common Object Request Broker Architecture (CORBA)

  26. Information System Users and Their Needs • A SA must understand the company’s organizational model in order to recognize who is responsible for specific processes and decisions and to be aware of what information is required by whom

  27. Information System Users and Their Needs • Top managers – develop long range plans called strategic plans, define the company overall mission and goals (SISP) • Middle Managers and Knowledge Workers - just below the top level, provide direction, resources and performance feedback to teams and supervisors • Supervisors and Team Leaders – carry out day-to-day functions and oversee operational employees • Operational Employees – users who rely on TPS to enter and receive data

  28. Systems Development Tools and Techniques • SA must know how to use a variety of techniques such as modeling, prototyping, and computer-aided systems engineering tools to plan, design, and implement information systems • SA work with these tools in a team environment

  29. Systems Development Tools and Techniques • Modeling • Used to describe and simplify an IS: • Business or requirements model – information that a system must provide • Data model – data structures and design • Object model – consist of data and process • Network model – design and protocols of telecomm. links • Process model – logic that programmers use to write code modules

  30. Systems Development Tools and Techniques • Prototyping • Definition: an early working version of an IS • Adv: Speeds up the development process • Disadv: Important decisions might be made too early, before business or IT issues are thoroughly understood • Can be an extremely valuable tool

  31. Systems Development Tools and Techniques • Computer-Aided Systems Engineering (CASE) Tools • Framework for systems development and support a wide variety of design methodologies • CASE tools – make easier to built an information system, boost IT productivity and improve the quality of the finished product. • Upper CASE – (conceptual|logical) design • Lower CASE – physical design

  32. Systems Development Methods • Structured analysis and object-oriented analysis are both popular methodologies for developing computer-based information systems • A SA should understand the alternative methodologies and their individual strengths and weaknesses

  33. Systems Development Methods • Structured Analysis • Uses a set of process models to describe a system graphically • Systems development life cycle (SDLC)

  34. Systems Development Methods • Object-oriented (O-O) analysis • O-O analysis combines data & processes into objects • Object is a member of a class • Class is a collection of similar objects • Objects possess properties • Methods change an object’s properties • Messages request specific behavior or information from another object

  35. Systems Development Methods • Joint Application Development and Rapid Application Development • JAD – Team based fact finding • RAD – compressed version of the entire process • Other development methodologies • Microsoft Solutions Framework (MSF) • Spiral Model • Extreme Programming • RUP

  36. The Systems Development LifeCycle • SDLC used to plan and manage the systems development process • It includes the following steps: • Systems planning phase • Systems analysis phase • Systems design phase • Systems implementation phase • Systems operation, support, and security phase • Deliverable or end product

  37. The Systems Development Life Cycle • Traditionally pictured as a waterfall model, but is also presented as an interactive model depicting real world practice and the constant dialog among users, managers, and systems developers

  38. The Systems Development Life Cycle • Systems Planning • To identify the nature and scope of the business opportunity or problem • Systems request – begins the process & describes problems or desired changes • Systems planning includes preliminary investigation whose key part is a feasibility study • End product: Preliminary Investigation Document, Software Development Plan (SDP)

  39. The Systems Development Life Cycle • Systems Analysis • To build a logical model of the new system • First step is requirements modeling, where you investigate business processes and document what the new system must do • End product: system requirements document

  40. The Systems Development Life Cycle • Systems Design • Purpose is to create a blueprint that will satisfy all documented requirements • Identify all outputs, inputs, and processes • Avoid misunderstanding through manager and user involvement • End product: systems design specification

  41. The Systems Development Life Cycle • Systems Implementation • New system is constructed • Write, test, & document programs • File conversion occurs • Users, managers, IT staff trained to operate and support the system • Systems evaluation performed

  42. The Systems Development Life Cycle • Systems operation, support, and security • New system supports operations • Maintenance changes correct errors or meet requirements • Enhancements increase system capability • Well-designed system will be secure, reliable, maintainable, and scalable • SDLC ends with system replacement

  43. Systems Development Guidelines • Planning • Involve users throughout the development process • Listening is very important • Create a time table with major milestones • Identify interim checkpoints • Remain flexible • Develop accurate cost and benefit information

  44. Information Technology Department • The information technology (IT) department develops and maintains a company’s information systems • The IT group provides technical support

  45. Information Technology Department • Application Development • Team may include users, managers and IT staff members • Systems Support and Security • Provides hardware and software support • User Support • Provides users with technical information, training, and productivity support • Help desk

  46. Information Technology Department • Database Administration • Database design, management, security, backup, and user access • Network Administration • Includes hardware and software maintenance, support, and security • Web Support • Design and construction of Web pages and presence • Important for e-commerce • Webmaster

  47. The Systems Analyst Position • A systems analyst investigates, analyzes, designs, develops, installs, evaluates, and maintains a company’s information systems • On large projects, the analyst works as a member of an IT department team • Smaller companies often use consultants to perform the work

  48. The Systems Analyst Position • Responsibilities • Translate business requirements into practical IT projects to meet needs • Required Skills and Background • Solid communication skills and analytical ability

  49. The Systems Analyst Position • Certification • Professional credential • Career Opportunities • Job titles • Company organization • Company size • Corporate culture • Salary, location, and future growth

More Related