There are two variables that contribute both good and bad things that contribute to help an eyewitness to identify a suspect. These two variables are estimator variables and system variables. Estimator variable are external factors that influence eyewitness testimony. They also show how accurate the recollection of the events is. Examples of a estimator variable would be things such as if the victim and the suspect are of different races. However, estimator variables can not be controlled by others. System variables are those factors that are (or can be) under the control of the justice system. Examples of a system variable would be if the investigator says anything to influence the victim before the photo or in person line up. As for the
