上海交通大学：《面向对象软件工程 Software Engineering》课程教学资源（PPT课件讲稿）01. Introduction to Software Engineering

上降文通大学 SHANGHAI JLAO TONG UNIVERSITY 1.Introduction to Software Engineering 漏 p SHANG 1日g石 ERSIT

1. Introduction to Software Engineering

上游充大学 Outline SHANGHAI JIAO TONG UNIVERSITY What is software Software is Everywhere Software Crisis and Software Failures From Software Development to Software Engineering Development Activities Chapter 1 Software Engineering

Software Engineering Outline What is software Software is Everywhere Software Crisis and Software Failures From Software Development to Software Engineering Development Activities Chapter 1

上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY 1.What is software Software Engineering

Software Engineering 1. What is software

上游充通大兽 1.1 Software vs.Hardware SHANGHAI JIAO TONG UNIVERSITY Hardware-the physical components of the computer Software-programs that run on the hardware The first general-purpose electronic computer,ENIAC After the program was figured out on paper,the process of getting the program "into"the ENIAC by manipulating its switches and cables took additional days. Glen Beck(background)and Betty Snyder(foreground)program the ENIAC in BRL building 328.(U.S.Army photo) Software Engineering

Software Engineering Hardware-the physical components of the computer Software- programs that run on the hardware The first general-purpose electronic computer, ENIAC 1.1 Software vs. Hardware Glen Beck (background) and Betty Snyder (foreground) program the ENIAC in BRL building 328. (U.S. Army photo) Af t e r t h e p r o g r a m w a s figured out on paper, the p r o c e s s o f g e t t i n g t h e program "into" the ENIAC by manipulating its switches and cables took additional days

上游充通大学 SHANGHAI JIAO TONG UNIVERSITY Ada Lovelace (1815-1852) Grace Murray Hopper (1906-1992) The First Programmer The Inventor of Cobol Woman and Software Engineering Software Engineering

Software Engineering Ada Lovelace（1815-1852） Grace Murray Hopper (1906-1992) The Inventor of Cobol Woman and Software Engineering The First Programmer

上游充通大兽 1.2 Software Types SHANGHAI JIAO TONG UNIVERSITY User System Software It includes the Operating System and all the Application utilities that enable the computer to function. Application Software Operating system It includes programs that do real work for user. Hardware Open Source Software It is computer software whose source code is available under TM a license that permits users to use,change,and improve the open source software,and to redistribute it in modified or unmodified form 己0⑤年西 Proprietary Software(non-free software 豆A③®g It is software with restrictions on using,copying and modifying as enforced by the proprietor.Restrictions on use, 、尼马 modification and copying is achieved by either legal or technical means and sometimes both. Software Engineering

Software Engineering 1.2 Software Types System Software • It includes the Operating System and all the utilities that enable the computer to function. Application Software • It includes programs that do real work for user. Open Source Software • It is computer software whose source code is available under a license that permits users to use, change, and improve the software, and to redistribute it in modified or unmodified form Proprietary Software (non-free software ) • It is software with restrictions on using, copying and modifying as enforced by the proprietor. Restrictions on use, modification and copying is achieved by either legal or technical means and sometimes both

上海充通大学 1.3 Software vs.Program SHANGHAI JIAO TONG UNIVERSITY ④“computer software,or just software,isa collection of computer programs and related data that provide the instructions for telling a computer what to do and how to do it" From wikipedia Software Programs Data Associated Documentation Software Engineering

Software Engineering 1.3 Software vs. Program “computer software, or just software, is a collection of computer programs and related data that provide the instructions for telling a computer what to do and how to do it” From wikipedia Software = Programs + Data + Associated Documentation

上充￥1.4 Software Characteristics SHANGHAI JIAO TONG UNIVERSITY © Software is developed or engineered,it is not manufactured in the classical sense Software doesn't wear out Failure Rate Increased Failure failure rate due Wear out Rate to side effects Actual curve Infant mortality Idealized Change curve Time Time Although the industry is moving toward component- based assembly,most software continues to be custom built Software Engineering

Software Engineering 1.4 Software Characteristics Software is developed or engineered, it is not manufactured in the classical sense Software doesn’t wear out Although the industry is moving toward component- based assembly, most software continues to be custom built Time Failure Rate Infant mortality Wear out Time Failure Rate Actual curve Idealized Change curve Increased failure rate due to side effects

上游充通大粤 SHANGHAI JIAO TONG UNIVERSITY 2.Software is everywhere MPlayer Adobe Software Engineering

Software Engineering 2. Software is everywhere

上游充通大兽 SHANGHAI JIAO TONG UNIVERSITY More and more systems are software controlled trism 5D COMPUTER SOFTWARE 因 Software is sold by retail Software Engineering

Software Engineering More and more systems are software controlled Software is sold by retail