SWT Privat at Hochschule Esslingen

1. Generic Software: Software to be sold on an open market or open source software. e.g Firefox

2. Custom Software: Software which is developed for an specific customer. E.g. the VVS App

3. Embedded Software: Software which is running in Hardware Devices, like the firmware of a digital alarm clock

“Software engineering is the process of solving customers’ problems by the systematic development and evolution of large, high-quality software systems, within cost, time, and other constraints.” 

Important because we have to develope reliable and thurstworthy software systems economically and quickly. 

Furthermore in a long term it is cheaper.

Software Crisis. 

Projects started to increase in complexity and development costs exploded.

They delivered:

Over time

Over budget 

Wrong software

Software with bad quality

Unmaintainable software

Systematic, scientific, quantifiable, mathematical, forecast 

Cost, time, quality 

Development, operation and maintenance 

Social, needs of society, safety to lives and property, intended function

A Software Engineering principle that says, you have to devide a big probleme into smaller, more handable parts.

Seperate the why from the how.

Aufteilen und erobern.

Part of Seperation of concerns. 

Slice big problems in smaller parts.

finding

analyzing

understanding

documentation

validation 

maintaining

First Step in Plan-Driven Projects.

Performed throughout the Lifetime in agile Models.

What should a System do?

• services and propertys
• constraints
• purpose

Needs of customer

Not independent

Problem: How much details

Persons that are affected by the system or have interest in it.

Client

Investor

End User

Manager

Technical Support

Administrator

Non-material

hard to visualize

hard to develop but easy to copy

easy to modify but hard to modify correct

no wear and tear