A book presenting the architecture of a new routing protocol for Clustered Heterogeneous Wireless Sensor Networks (WSNs). It also presents an overview of existing cluster based heterogeneous routing protocols of WSNs. Furthermore, known developments and their challenges in WSNs for gathering and routing information are also discussed. There is still works to be done in the area of clustered routing protocols for WSNs. Some of the key issues for future works are also mentioned.