The University of Calgary offered a senior-level computer science course called Computer Viruses and Malware. The course taught students how to write viruses, worms, and Trojan horses. It also discussed the history of computer viruses and taught students how to block attacks. All course assignments were done on a closed computer network isolated from the Internet. Some computer security experts criticized the university for offering the course. One researcher said, No one argues criminology students should commit a murder to understand how a murderer thinks [98]. Debate whether the University of Calgary was wrong to offer the course.