What factors influence the reliability of eyewitness testimony?

https://www.apa.org/about/offices/ogc/amicus/new-hampshire.pdf According to the APA, what factors influence the reliability of eyewitness testimony? — What specific circumstances of the Perry case might have affected the witness’s reliability? Describe the circumstances and explain how they affect reliability. — What methods might the police have used to increase the reliability of the witness’s identification?