Research is being carried out for discovering various techniques to efficiently utilize the sensor node’s energy in a wireless sensor network. The authors have observed that most energy efficient technique for data transmission in a wireless sensor network is considered to be clustering approach. It is very effective in reducing the energy dissipation of a WSN upto a great extent as compared to rest of the techniques. Now, they should try to concentrate on the ways to improve the clustering techniques so that good and energy efficient clusters are formed.