Software Theory Presentation
- 1. Software Theory 2 Diploma 5 14 August 2007 Alex Murch Marangu TC
- 2. What is software? Software is a set of instructions that works with computer hardware to perform tasks. These tasks are also called “operations.” Hardware Software You (the user)
- 3. Software is like a cassette… Software
- 4. Types of software System software Operating system (O.S.) Basic input/output system (BIOS) Application software Word processing Spreadsheet Database
- 5. Software working with hardware System Software CPU Hard Disk Memory Monitor Mouse Keyboard Scanner Camera Application Software
- 6. Basic input/output system The software that tests hardware on startup, starts the operating system and supports the transfer of data among hardware devices Stored in read-only memory Almost invisible to regular users
- 7. Operating System The software that controls the allocation and usage of hardware resources such as memory, central processing unit (CPU) time, disk space and peripheral devices
- 8. O.S. Examples Microsoft Windows (95, 98, ME, 2000, XP) Linux UNIX Solaris*
- 9. Functions of the O.S. Coordinate processing Manage system memory Control peripheral devices (monitor, mouse, keyboard, etc) Looks for problems (malfunctions) Manages files on the hard disk drive
- 10. O.S. Classification (1/4) Real-time operating system (R.T.O.S.) Exact timing of operations
- 11. O.S. Classification (2/4) Single user, single task Simple devices like cell phones
- 12. O.S. Classification (3/4) Single user, multi-tasking Allows user to do many things at one time Used with most desktop and laptop computers Example: Windows XP Single user, multi-tasking O.S. 1 user 1 computer Word processor Spreadsheet Picture editor Internet browser Many tasks
- 13. O.S. Classification (4/4) Multi-user operating system Many users share system resources Example: Solaris thin client Multi-user O.S.
- 14. Discussion What is the BEST kind of operating system?
- 15. Application Software Where does it fit in? Computer Hardware BIOS Operating System Application Software You (the user)
- 16. Types of Application Software Word processor Spreadsheet Presentation Database Email client Web browser Desktop publishing Accounting Web development Graphics and imaging Programming Etc…
- 17. Word Processor Software Microsoft Word OpenOffice.org Writer* StarWriter Lotus Ami Pro Corel WordPerfect
- 18. Spreadsheet Software Microsoft Excel OpenOffice.org Calc* StarCalc Quattro Pro Lotus 1-2-3
- 19. Presentation Software Microsoft PowerPoint OpenOffice.org Impress* StarImpress KPresenter
- 20. Database Software Microsoft Access OpenOffice.org Base* MySQL Sybase Oracle FileMaker
- 21. Web Browser Software Mozilla Firefox Opera Netscape Navigator Safari Microsoft Internet Explorer
- 22. Graphical User Interface (G.U.I.) Most application software uses a G.U.I. Definition: A graphical user interface is a visual environment that represents programs, files and options with graphical images on the screen
- 23. G.U.I. Example
- 24. Advantages of G.U.I. Less work for the user User can simply point and click with the mouse Easier/faster to learn Hides program complexity from the user Simplifies multi-tasking Easy to perform multiple tasks at once
- 25. Disadvantages of G.U.I. Not all software functions are available Slower performance Text-based systems work faster
- 26. Free / Open Source Software What is it? Software that is freely available for use Design engineering is transparent Not patented and not for profit Example OpenOffice.org Discussion: Why use open source software?
- 27. Software Development Cycle Analysis Design Programming Testing Implementation Further Development
- 28. Software Analysis Software project outline Discussions with software users Work is performed by systems analysts
- 29. Software Design Project is broken down into smaller sections And even smaller sub-sections Detailed specifications are created Programming language is selected Work is performed by systems analysts
- 30. Programming Software design is programmed Specific programming language is used Work is performed by programmers
- 31. Testing Complete testing of all program functions Errors ( bugs ) are noted and reported back to Systems analysts who check program logic Programmers who check syntax
- 32. Implementation Software is installed for use Usually starts with group of advanced users Small group size Called a “pilot group” Errors are reported back to analysts and programmers
- 33. Further Development After software is released to a large group of users More error/bug fixing Design/efficiency improvements
- 34. Discussion How is the software development cycle like lesson planning? Compare open source software to lesson plans – are there advantages to sharing your work?