Software engineering involves specification, development, validation, and evolution of software. It focuses on practical application, while computer science focuses more on theory. Software engineering is a part of system engineering, which deals with all aspects of computer systems including hardware, software, and processes. Key challenges include developing trustworthy software within reduced timelines for increasingly diverse needs. Software is affected by heterogeneity across devices, as well as security, business needs, and social changes. Development costs make up 60% of software costs, while testing costs are 40%. Good software has maintainability, dependability, reusability, efficiency, and acceptability. Designing web systems considers reusing existing software, incremental development, and interface constraints of browsers.

1. Software Engineering
1 - Introduction

2. Name the fundamental software engineering
activities?
• Specification
• Development
• Validation
• Evolution

3. What is the difference between Software
engineering and Computer science?
• Computer science – focuses on theories and fundamentals
• Software engineering – focuses on practicalities in developing and
delivering software

4. What is the difference between Software
engineering and System engineering?
• System engineering – all aspects of computer system engineering ;
hardware, software and process engineering
• Software engineering – a part of system engineering

5. What are key challenges to Software engineering?
• Developing trustworthy software
• Demand for reduced delivery time
• Increasing diversity

6. Name three issues that affect software?
• Heterogeneity = software being distributed systems; desktop and
phone
• Security and trust
• Business and social change

7. What are costs of Software engineering?
Develoment
Cost
60%
Testing Cost
40%
Costs
Develoment Cost
Testing Cost
Evolution cost > Development cost

8. Name four attributes of good software?
• Maintainability
• Dependability and security
• Efficiency
• Acceptability

9. Name three significant factors important in
designing web based systems?
• Reusing existing software
• Incremental development and delivery (Impractical to specify all
requirements in advance)
• User interface design is constrained by browser capabilities