1 Introduction to Software Engineering Lecture 39 – Software Development.

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Presentation transcript:

1 Introduction to Software Engineering Lecture 39 – Software Development

2 Lecture Outline Why do companies require high-quality software in business systems, industrial process control systems, and consumer products?

3 Strategies to Engineer Quality Software High-quality software systems Operate safely and dependably Have a high degree of availability Required to support the fields of Air traffic control Nuclear power Automobile safety Health care Military and defense Space exploration

4 Strategies to Engineer Quality Software (continued) More and more users are demanding high quality software Software defect Could cause a system to fail to meet users’ needs Impact may be trivial or very serious Patches may contain defects Software quality Degree to which software meets the needs of users

5 Strategies to Engineer Quality Software (continued) Quality management How to define, measure, and refine the quality of the development process and products Objective Help developers deliver high-quality systems that meet the needs of users Deliverables Products such as: Statements of requirements Flowcharts User documentation

6 Strategies to Engineer Quality Software (continued) Primary cause for poor software quality Developers do not know how to design quality into software Or do not take the time to do so Developers must Define and follow a set of rigorous engineering principles Learn from past mistakes Understand the environment in which systems operate Design systems relatively immune to human error

7 Strategies to Engineer Quality Software (continued) Programmers make mistakes in turning design specifications into code About one defect for every 10 lines of code Pressure to reduce time-to-market First release Organizations avoid buying the first release Or prohibit its use in critical systems Usually has many defects

8 The Importance of Software Quality Business information systems are a set of interrelated components Including Hardware Software Databases Networks People Procedures

9 The Importance of Software Quality (continued) Business information system examples Order-processing system Electronic-funds transfer system Airline’s online ticket reservation system Decision support system (DSS) Used to improve decision making Software for industrial use Software controls the operation of many industrial and consumer products

10 Key Points More and more users are demanding high quality software How to define, measure, and refine the quality of the development process and products?