The identification of the process plays an integral part in autotuning. The objective of this paper is to formulate an improved autotuning method by thoroughly investigating the shapes of the relay feedback responses and extracting additional information about the process dynamics. The relay feedback tests are conducted on different processes with wide range of dead time to time constant ratio. Useful observations related to shape, limit cycle data and process parameters and hence classification are made. The step-by-step procedures for identification of processes under various categories are evolved. The proposed method is useful, when nothing is known a priori about the process.