Deployment of sensor networks is concerned with setting up an operational 
wireless sensor network in a real-world setting. Unfortunately, deployment is 
a labor-intensive and cumbersome task as environmental influences often 
degrade performance or trigger bugs in the sensor network that could not be 
observed during lab tests. In this paper, we, firstly, study existing sensor 
networks to identify and classify typical problems that have been encountered 
during deployment. Secondly, we investigate whether and how the existence of 
these problems can be detected by means of "passive inspection", where 
messages exchanged in the sensor network are overheard and analyzed such that 
modification of the sensor network is not required. We, thirdly, show how 
passive inspection can be implemented in a practical tool.