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Start thinking of old times when you had to
put a key into the lock and turn it to unlock the car door. 3 Is this what you ??™ d want
as a user? Think of all its nice side effects: the lock freezes in winter, or you scratch
the paint as you try to fi nd the key hole, or you have to dig deep in your pocket to
fi nd the key. As a user, you ??™ d want to have a locked car. Nothing more!
2.1 Case Study
FIGURE 2-4
The solution search space.
Ideal system
Real solution
Search space
3You know how old you are if you really remember.
32 CHAPTER 2 The Pragmatic SYSMOD Approach
Modern cars all have central locking systems that can be unlocked from the
remote control at the key. Get your key, press the door unlock button, and off you
go. The locking system itself is less evident for the user, but it offers the same functionality.
However, there is still no ideal system, and there are new inconveniences.
For example, you realize only when you already buckled up that the key is still in
your pocket, but you need it to start the car.


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