New and experienced law enforcement agents, among others, need extensive training in techniques for interviewing and interrogation. However, it is often difficult for the student to practice those techniques before putting them to use in investigative work. Practice interviews using actors are not always realistic and are too expensive. As a result, interactive, multimedia software that involves a simulated subject has been created to help trainees develop their interview and interrogation techniques using personal computers. Although the trainee must select questions from a predetermined list, the available questions are many. Users are required to observe both verbal and nonverbal behavior and to make well-reasoned decisions. Chances to make errors are presented at every decision point. The simulated subject responds differently each time the system is used and will sometimes be deceptive or truthful. Even the truthful subject will react to questions and show signs of deception. The goal of the trainee is to navigate the subject through different behavioral states and then determine if the subject is truthful. (The FBI is funding this program.)