Advances in ultrafast laser technology have enabled the examination of electron dynamics on atomic time scales. The time intervals are very tiny, of the order of attoseconds. Recent interest in investigating time delay in photoionization processes were triggered by a few ultrafast measurements that revealed the time interval associated with photoionization. The theoretical formalism to analyse these processes was developed by Wigner, Eisenbud and Smith. Electron correlations have an important impact on the Wigner-Eisenbud-Smith (WES) time-delay. In the present talk, I will present my results on WES time delay studies in which electron correlations at different interesting situations have been found to be of great importance in determining the WES time delay.