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Wireless Sensor Networks (WSNs) are no longer limited to scenarios of uncontrolled performance. A new emerging range of applications demand specific Quality of Service (QoS) assurance and the support of critical scenarios. However, QoS in WSNs, and a reference model to characterize and measure it, are yet challenges to be met. In this paper, a new taxonomy of WSNs with QoS is proposed, including information and communication perspectives. The goal is to contribute to the establishment of a reference model to enable the classification of WSNs in general, including the ones with QoS, and aid in the development of a new set of QoS metrics that fully characterize this new type of networks.