Dear Bruce,

I have some problems with abstractions/ kinds of subsystems, especially with logical and physical. The reason is, that logical subsystems often map to multiple physical subsystems and a physical subsystem can contain multiple logical subsystems.

In one of your SE book there is an example for physical subsystems.

[...]

For example, an automotive braking subsystem will contain mechanical (brake pedal, braking pads), hydraulic (pistons, o-rings, pump, fluid reservoir), electronic (ECU,2 pedal position, wiring), and software (ABS) components

[...]

(1)

With this description, I would model an _subsystem and components view_ that has separate components ECU and software, even if the software do run on the ECU of course. I would show this relation in an separate view? What is necessary in Handout and is it an SE or SW task? It is always difficult for me to separate Systems Engineering from native downstream disciplines.

(2)

When I show logical subsystem, then it may be possible that a subsystem contains hydraulic, electric parts and SW. In a _deployment view_ I have to identify the engineering disciplines. Right?

(3)

Which possibilities can I use to show the relation of logical parts of deployment view and physical components?

Thank you very much!

Best regards

Matthias