Testimonies are important to be accurate for judges, prosecutors and indirectly for all of us. Errors and distortions in testimony do not necessarily occur intentionally. The witness participates in the proceedings, which provides a means of proof in the form of testimony. Testimony is one of the evidence on this subject in general, the same rules of evaluation as other evidence. Human behavior in a receiving or witnessing situation can be understood as participation in a social situation. One of the most important reports in experimental social psychology on the evaluation of evidence is overestimating the accuracy of testimony. The main problem of witness testimony from a psychological point of view is determining the degree of credibility of the testimony. Factors to consider are the personality and motivation of the witness resulting from certain situations in which the witness was in a relationship with the perpetrator at the time of the crime. The testimony is formulated in three stages: obtaining information on the content (perception), its memorization and its storage. in memory and maintenance. Perception is a complex system of processes that create a subjective image called observation. This happens when appropriate stimuli interact with the senses. There are two levels of human perception: -sensorimotor - receiving, encoding and processing information about the properties of objects from elements of the environment. - semantic operations - connecting elements of the environment with objects previously learned from previous experiences. According to scientists, perception depends on: the age, the sex of the observer, the precision of the senses, the selectivity of perception, the attitude of the observer. To perception...... middle of paper ...... tenses must be put on a person of a certain race or nationality .G. Allport conducted an experiment in which he showed photos of people on the subway (Eberhardt et al. 2004). One of them was a white man with a razor in his hand and the other was a black man. 50% of participants said they had seen a black man with a razor. This experiment shows that biases play an important role in eyewitness recollection and testimony. These sample experiments show how our memory and memorization are influenced by many factors. The creation of false memories is still being studied. When giving testimony, professionals should remember these factors, especially during a court case. The testimony of the group of friends in front of the disco could have been influenced by prejudice, illegal substances, previous experiences with the same young person and many other factors..