About What is a Use Case?
Designing scenarios: Making the case for a use case framework (1993)
“Recently, I have had conversations with a number of people who were attempting their first object-oriented project. Most of these people claimed to be using “use cases” in their object-oriented analysis and design approaches. However, listening to them describe their projects, it became quite apparent to me that there is a great deal of confusion regarding the definition, context, and use of use cases. This confusion can (and often does) lead to poorly-designed systems.”
Edward V. Berard (1996) " Be Careful With" Use Cases http://www.tao.com/pub/html/use_case.html" The Object Agency, Inc.
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Source: Object-Oriented Software Engineering: A Use Case Driven Approach (1992), p. 133 as cited in: " Object Oriented Software Engineering: A Use Case Driven Approach Ivar Jacobson, et al. (1992) http://tedfelix.com/software/jacobson1992.html", Book review by Ted Felix on tedfelix.com, 2006.
About Conclusion
Designing scenarios: Making the case for a use case framework (1993)

Source: Object-oriented design: With Applications, (1991), p. 141