- •English For it Students
- •Предисловие
- •Vocabulary:
- •Central Processing Unit (cpu)
- •Vocabulary:
- •Unit 2. Programming
- •Creating Computer Programs
- •Vocabulary:
- •Structured and Object-Oriented Programming
- •Vocabulary:
- •Unit 3. Databases Text 7 Databases and Database Management Systems
- •Database Structures
- •Unit 4. Networks
- •Network Structures
- •Vocabulary:
- •A(an) __________ is a way to connect computers so that they can communicate, exchange information, and share resources in real time.
- •Network Topologies
- •Internet
- •Vocabulary:
- •Unit 5. Information Systems
- •Building Information Systems
- •Vocabulary:
- •Part II
- •Unit 1. Computers around Us
- •Importance of Computer Literacy
- •Shapes of Computers Today
- •Technical Documentation
- •Types of Documentation
- •Computing Issues That Affect Us All Computer Crime
- •Computer Viruses
- •Unit 2. Input, Output, Storage Devices
- •The Mouse
- •Variants of the Mouse
- •Alternative Methods of Input Devices for the Hand
- •Optical Input Devices
- •Audiovisual Input Devices
- •Monitors and Sound Systems Monitors
- •Pc Projectors
- •Sound Systems
- •Printers
- •Types of Storage Devices
- •Magnetic Storage Devices
- •Unit 3. Operating System
- •Types of Operating Systems
- •Windows xp
- •Brief History of Linux
- •Unit 4. Application Software
- •Word Processing Software
- •Desktop Publishing Software
- •Spreadsheet Software
- •Database Management System
- •Presentation Programs
- •Managing the Small or Home Office
- •Working With Images Computer Platforms Used for Graphics
- •Types of Graphics Files
- •Getting Images Into Your Computer
- •Graphics Software
- •Digital Photography
- •Photography the Old Way
- •Multimedia
- •Creating and Distributing New Media Content
- •Technologies That Support New Media
- •Distributing New Media Content
- •Virtual Reality
- •Uses for Virtual Reality
- •Vr Hardware and Software
- •Pc As an Entertainment Center
- •Utility Software
- •Unit 5. Processor and Memory cpUs Used in Personal Computers
- •Universal Serial Bus (usb)
- •Musical Computers
- •Flash Memory and Cache Memory Flash Memory
- •Cache Memory
- •Memory and Computing Power
- •Unit 6. Programming
- •Visual Programming
- •Fourth-generation Programming Languages
- •Artificial Intelligence
- •Some Examples of ai Techniques
- •Building an Artificial Brain
- •Unit 7. Networks and the Internet Networking at Home and Around the World Data Communications Over Standard Telephone Lines
- •Networks in the Home
- •Isdn, t1, and t3
- •Dsl Technologies
- •Avoiding a Tangled Mess
- •From the History of the Internet
- •Getting Online, Working Online Accessing the Internet
- •Connecting a pc to the Internet
- •Commerce on the World Wide Web
- •Getting Published on the Internet
- •Minding Your Manners Online
- •Graphics Piracy on the Internet
- •Ignorance Is No Excuse
- •Staying Out of Trouble
- •Freebies on the Web
- •Personal Web Pages
- •Unit 8. Information Security Protecting Your Online Privacy
- •Macro Viruses
- •Viruses That Do Not Require Attachments
- •Protecting Yourself
- •Vocabulary
- •Литература:
- •Содержание Part I Computer Basics
Unit 5. Information Systems
Text 12
Development of Information Systems
Read and translate the text:
An information system (IS) is a mechanism that helps people collect, store, organize, and use information. An information system includes a means of storing information, a set of procedures for handling information, and rules that govern the delivery of information to people in an organization. Traditionally, information systems were manual. One popular type of manual information system is the card-based system, such as a card catalog in a library. Because there are so many types of information and uses for it many kinds of information systems have been developed: office automation systems, transaction processing systems, management information systems, decision support systems, expert systems.
Office automation systems automate routine office tasks, such as word processing, accounting, document management or communications. Transaction processing systems not only track and store information about individual events but also provide information that is useful in running an organization, such as inventory status, billing, and so on. Management information systems produce reports for different types of managers. Decision support systems is a specialized application used to collect and report certain types of business data which can aid managers in the decision-making process. Expert systems include the knowledge of human experts in a particular area (such as medicine or technology) in a knowledge base. They analyze requests from users and assist the users in developing a course of action.
A well-structured IS department includes IS managers, computer scientists, systems analysts, programmers, database specialists, user assistance architects, technical writers, system or network managers, trainers, and hardware maintenance technicians. IS professionals support an organization's information, provide technical support for hardware and software and are involved in the design and implementation of an organization's entire information system.
Building Information Systems
The systems development life cycle (SDLC) is an organized method for building an information system. The SDLC includes five phases: needs analysis, systems design, development, implementation, and maintenance.
During the needs analysis phase, the development team focuses on completing three tasks: (1) defining the problem and whether to proceed, (2) analyzing the current system and developing possible solutions to the problem, and (3) selecting the best solution and defining its function.
During the systems design phase, the project team decides how the selected solution will work; each system activity is defined.
During the development phase, programmers play the key role: creating or customizing the software for the various parts of the system. There are two alternative paths through this phase: the acquisition path or the development path. The project team may decide to buy and then customize some components for an information system or develop the needed components themselves. Technical and user documentation is written during the development phase. Testing is also an integral part of this phase.
In the implementation phase, the hardware and software are installed in the user environment. The process of moving from an old system to a new one is called conversion. The project team may follow four different conversion methods: direct, parallel, phased, and pilot.
During the maintenance phase, IS professionals provide ongoing training and support to the system's users. Fixes or improvements are made regularly throughout the remaining life of the system.