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A lifephase model describes several time sections: development, realization,
use, and disposal. The problems in the development of systems arise from the fact
that consequences of the decisions that have to be made during the development
phase will only become effective in later phases. In the later lifephases, however,
there is normally no way to infl uence the system properties to a larger extent.
This situation poses important questions that we have to answer in the development
phase:
?– What problems does the system solve?
?– What problems does the system create?
?– In which environment will the system be used?
?– How long should the system be used?
?– How will the system be replaced by a successor?
1.2 Systems Engineering
FIGURE 1.2
Group of tasks in systems engineering.
pkg Systems engineering tasks
Requirements
analysis
Systems
engineering
System design
Project
management
Requirements
management
System
validation
System
verification
Requirements
definition
System
integration
Risk
management
10 CHAPTER 1 Introduction
Here is a simple example, something I currently have to deal with, but which you
surely know very well: moving.
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