Energy consumption have found to be vital issue in WSNs. Data aggregation techniques have become a major part of WSNs to overcome the problem energy consumption by reducing the flooding at the base station. Also, data aggregation techniques reduce the communication cost of WSNs because it reduces the redundant data by aggregation. However, certain improvements have been proposed for the cluster head selection optimization as well to enhance the lifetime further. This paper is to evaluate the performance of the LEACH, iLEACH and DA-LEACH.