This paper considers issues related to information management in centralised and decentralised sensor networks. The sensor management is treated in the light of different applications: detection, classification and tracking of moving objects. Information management is the process of optimising the information flow and is highly dependent on measures of information. Often used information measures are considered. Further, problems of localisation of mobile nodes in wireless ad hoc networks are addressed and mobility tracking in wireless networks. Results for mobility tracking based on Monte Carlo methods are presented.