Eyewitness testimony plays a significant role in many criminal investigations and legal proceedings. The accuracy of eyewitness identification can be influenced by various factors, including the lineup procedure employed. Both simultaneous lineups and show-up procedures have their advantages and disadvantages, and the choice between them depends on the specific circumstances and goals of the investigation.Simultaneous Lineup:-In a simultaneous lineup, the eyewitness is presented with a group of individuals, including the suspect, simultaneously. The eyewitness must identify the person they believe is the perpetrator from the lineup.