¹Scenarios play a role in other methodologies. See for example [Jacobson, 1992], [Lorenz, 1993] and [Rumbaugh, 1991]. Jacobson and Lorenz use the term "use case" instead of "scenarios".
[2][Mark Lorenz, 1993]
³[Rumbaugh, 1991] discusses in great detail the problem of modeling these types of relations between objects and classes. Also see [de Champeaux, 1993].