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Lead Black Slide. Chapter 5. Information System Software. Our Agenda. Software Concepts Application Software System Software Software Development. Learning Objectives. Explain in detail what programs and software are. Identify the common application software used in information systems.

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  1. Lead Black Slide Powered by DeSiaMore

  2. Chapter 5 Information System Software Powered by DeSiaMore

  3. Our Agenda • Software Concepts • Application Software • System Software • Software Development Powered by DeSiaMore

  4. Learning Objectives • Explain in detail what programs and software are. • Identify the common application software used in information systems. • Describe some ways users can tell an operating system what to do. • Describe some of the capabilities of operating systems. Powered by DeSiaMore

  5. Learning Objectives (cont’d.) • Explain the main differences between the five types, or generations, of programming languages. • Explain the difference between object-oriented programming and traditional programming, and identify one traditional and one object-oriented programming language. Powered by DeSiaMore

  6. Learning Objectives (cont’d.) • Identify programming languages that are used with the Internet and the World Wide Web. Powered by DeSiaMore

  7. Software Concepts Information System Software Powered by DeSiaMore

  8. Software Concepts • A program is a set of instructions that tells the computer what to do. • Software can be a single program or a group of programs needed to perform several functions. • Simple programs may have a few hundred instructions (lines of code) though most have many more (several million). Powered by DeSiaMore

  9. Application Software Information System Software Powered by DeSiaMore

  10. Individual Application Software • Word processing • Spreadsheet • Graphics • Database • Browser Powered by DeSiaMore

  11. Workgroup Application Software • Groupware • E-Mail software • Information sharing software • Electronic conferencing software Powered by DeSiaMore

  12. Other Application Software • Organizational application software • Generally organization specific • Interorganizational application software • Electronic Data Interchange (EDI) • Generally common to the participating organizations Powered by DeSiaMore

  13. System Software Information System Software Powered by DeSiaMore

  14. Operating System Concepts • An operating system is a group of programs that manages the operation of the computer. • Three functions of an operating system • Process management • Resource management • Data management Powered by DeSiaMore

  15. Operating System Concepts (cont’d.) • Organization of an operating system • Most operating system programs are stored in secondary storage. • One operating system program is stored in a section of primary storage. It goes by various names – kernel – but generically called the “supervisor”. • The supervisor controls all activity in primary storage. Powered by DeSiaMore

  16. Using an Operating System • Starting the computer is called booting which transfers the “supervisor” from secondary storage to primary storage. • Connecting to a network or other multi-user environment is called logging in. • Detaching from a network is called logging out. Powered by DeSiaMore

  17. Elements of an Operating System • User interface is the visual link between the user and the software. • Small pictures on the screen are icons. • Graphical User Interface (GUI) uses • Buttons • Icons • Menus • Dialog boxes Powered by DeSiaMore

  18. Capabilities of Operating Systems • Multitasking is appearing to execute more than one program at a time, though the CPU can execute instructions from only one program at a time. Powered by DeSiaMore

  19. Capabilities of Operating Systems (cont’d.) • Multi-user or Multiple-user programs permit more than one person to use the program, and data, at a time. • One technique that is used with multiple-user operating systems is time sharing. With this technique, the users are each allocated a small amount of time by the operating system. Powered by DeSiaMore

  20. Capabilities of Operating Systems (cont’d.) • Two types of operating systems • Batch operating systems where the first program is executed and all data processed before moving to the second program. • Interactive operating systems allow user interaction as the program executes. Most personal computer operating systems permit user interaction. Powered by DeSiaMore

  21. Capabilities of Operating Systems (cont’d.) • Virtual memory is supplemental primary storage (RAM) or “real” memory where the programs are too big for primary storage. It is created on a secondary storage device, usually the hard drive, and is generally temporary in nature. Powered by DeSiaMore

  22. Capabilities of Operating Systems (cont’d.) • Virtual memory operating systems execute large programs by dividing the program into parts and transferring the necessary parts of the program from secondary storage to primary storage as needed. • The transfer process does not require any action by the user. Powered by DeSiaMore

  23. Personal Computer Common Operating Systems • Microsoft Windows • Microsoft DOS (and others) • IBM OS/2 • Apple Mac OS • UNIX • Linux Powered by DeSiaMore

  24. Multi-User Computer Common Operating Systems • IBM OS/390 • Hewlett Packard MPE (MultiProgramming Executive) • UNIX • Network Operating Systems • Novell Netware • Windows 2000 Server Powered by DeSiaMore

  25. Other System Software • Utility programs • Sort utility – rearranges data in a specified order • Merge utility – merges two files into one • Print utility – prints the contents of a file • Copy utility – copies data from one device to another Powered by DeSiaMore

  26. Other System Software (cont’d.) • Communications software – used for communications between computers. • Database management systems – used for managing databases. • Software development software – software used to develop software. Powered by DeSiaMore

  27. Software Development Information System Software Powered by DeSiaMore

  28. Programming Language Concepts • What is a programming language? • Why are there so many programming languages? • How do you select a programming language? • What are the types of programming languages? Powered by DeSiaMore

  29. What is a Programming Language • English is a natural language. It has words, symbols and grammatical rules. • A programming language also has words, symbols and rules of grammar. • The grammatical rules are called syntax. • Each programming language has a different set of syntax rules. Powered by DeSiaMore

  30. Why Are There So Many Programming Languages • Programming languages have evolved over time as better ways have been developed to design them. • Different programming languages are designed for different types of programs. • First programs were developed in the 1950s. Powered by DeSiaMore

  31. How Do You Select a Programming Language • Is it designed for the type of program that needs to be written? • Is it available on the computer being used? • Are trained programmers available? • Is it easy to write programs in the language? • Is the language efficient when the program is executed? Powered by DeSiaMore

  32. What Are the Types of Programming Languages • First Generation Languages • Second Generation Languages • Third Generation Languages • Fourth Generation Languages • Fifth Generation Languages Powered by DeSiaMore

  33. First Generation Languages • Machine language • Operation code – such as addition or subtraction. • Operands – that identify the data to be processed. • Machine language is machine dependent as it is the only language the computer can understand. • Very efficient code but very difficult to write. Powered by DeSiaMore

  34. Second Generation Languages • Assembly languages • Symbolic operation codes replaced binary operation codes. • Assembly language programs needed to be “assembled” for execution by the computer. Each assembly language instruction is translated into one machine language instruction. • Very efficient code and easier to write. Powered by DeSiaMore

  35. Third Generation Languages • Closer to English but included simple mathematical notation. • Programs written in source code which must be translated into machine language programs called object code. • The translation of source code to object code is accomplished by a machine language system program called a compiler. Powered by DeSiaMore

  36. Third Generation Languages (cont’d.) • Alternative to compilation is interpretation which is accomplished by a system program called an interpreter. • Common third generation languages • FORTRAN • COBOL • C and C++ • Visual Basic Powered by DeSiaMore

  37. Fourth Generation Languages • A high level language (4GL) that requires fewer instructions to accomplish than a third generation language. • Used with databases • Query languages • Report generators • Forms designers • Application generators Powered by DeSiaMore

  38. Fifth Generation Languages • Though no clear definition at present, natural language programs generally can be interpreted and executed by the computer with no other action by the user than stating their question. • Limited capabilities at present. Powered by DeSiaMore

  39. Programming Languages • Two broad groups • Traditional programming languages • Sequences of instructions • First, second and some third generation languages • Object-oriented languages • Objects are created rather than sequences of instructions • Some third generation, and fourth and fifth generation languages Powered by DeSiaMore

  40. Traditional Programming Languages • FORTRAN • FORmula TRANslation. • Developed at IBM in the mid-1950s. • Designed for scientific and mathematical applications by scientists and engineers. Powered by DeSiaMore

  41. Traditional Programming Languages (cont’d.) • COBOL • COmmon Business Oriented Language. • Developed in 1959. • Designed to be common to many different computers. • Typically used for business applications. Powered by DeSiaMore

  42. Traditional Programming Languages (cont’d.) • BASIC • Beginner’s All-purpose Symbolic Instruction Code. • Developed at Dartmouth College in mid 1960s. • Developed as a simple language for students to write programs with which they could interact through terminals. Powered by DeSiaMore

  43. Traditional Programming Languages (cont’d.) • C • Developed by Bell Laboratories in the early 1970s. • Provides control and efficiency of assembly language while having third generation language features. • Often used for system programs. • UNIX is written in C. Powered by DeSiaMore

  44. Object-Oriented Programming Languages • Smalltalk • First object-oriented language. • Developed by Xerox in mid-1970s. • Still in use on some computers. Powered by DeSiaMore

  45. Object-Oriented Programming Languages (cont’d.) • C++ • It is C language with additional features. • Widely used for developing system and application software. • Graphical user interfaces can be developed easily with visual programming tools. Powered by DeSiaMore

  46. Special Programming Languages • HTML • HyperText Markup Language. • Used on the Internet and the World Wide Web (WWW). • Web page developer puts brief codes called tags in the page to indicate how the page should be formatted. Powered by DeSiaMore

  47. Special Programming Languages (cont’d.) • XML • Extensible Markup Language. • A language for defining other languages. Powered by DeSiaMore

  48. Special Programming Languages (cont’d.) • JAVA • An object-oriented language similar to C++ that allows a web page developer to create programs for applications, called applets that can be used through a browser. • Objective of JAVA developers is that it be machine, platform and operating system independent. Powered by DeSiaMore

  49. Information Systems Software Key Terms Powered by DeSiaMore

  50. Assembler Assembly Language BASIC Booting Browser Button C C++ COBOL Command Compiler Database Software Dialog Box Electronic Conferencing Software Electronic Messaging Software FORTRAN Key Terms Powered by DeSiaMore

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