This hands-on, useful introduction to WSN systems development presents broad coverage of topics in the field, contributed by researchers involved in the ProSense project. It emphasises the practical knowledge required for the successful implementation of WSNs. The first part of the work covers basic issues of sensors, software, and position-based routing protocols. Part Two focuses on multidisciplinary issues, including sensor network integration, mobility aspects, geo-routing, medical applications, and vehicular sensor networks. The remaining two parts present case studies and further applications.