 Many examples of unity without reduction are local rather than global, and are not merely a phase in a global and linear project or tradition of unification (or integration). They are typically focused on science as a human activity. From that standpoint, unification is typically understood or advocated a piecemeal description and strategy of collaboration (on the distinction between global integration and local interdisciplinarity, see Klein 1990). Cases are restricted to specific models, phenomena or situations.