In this talk I will report on some efforts in measuring and modeling networked 
embedded systems. For the measurements, three approaches will be illustrated:
measuring one-way network delays, interrupt system response times, and
internal communication delays between componants in a system. Afterwards I will 
illustrate a modeling approach in which UML-based modeling, discrete-event 
simulation, and test automation will be integrated. In the last part I will present two 
automotive applications in which various kinds of modeling and also measurements
are necessary: transmission of safety-relevant sensor data and time-triggered 
architectures.