After researching what a thriller was, I then looked into the different sub genres that exist within a thriller. These included Action Thrillers (Die Hard), Crime Thrillers (The Usual Suspects), Film-Noir (sunset Boulevard), Sci-fi Thrillers (Aliens), Psychological Thrillers (Taxi Driver) and Religious Thrillers (The Da Vinci Code).
After identifying the basics of a thriller, I then applied my knowledge to the opening of 'When A Stranger Calls'. When watching the film I made notes of the stereotypical conventions that were used in order to have a deeper understanding of what makes a thriller.