Modem machines are often composed of components that are designed and manufactured by a number of suppliers and are expected to operate successfully over a wide range of dynamic environments when assembled. The main question is: "What information is needed to define a suitable dynamic test environment that will ensure that components will function properly when assembled?" This paper presents an overview of the theoretical model READI (The Rules for the Exchange and Analysis of Dynamic Information in Structural Vibration) that describes the pertinent variables and physical processes that control which data should he measured and how this data should he handled in generating realistic inputs to either a laboratory test of finite element model of a given test item. Past attempts to develop such a model have been essentially restricted to single point interface connections between structural elements. In this theory, multiple interface connections are considered as well as external loading that can be acoustic aerodynamic, etc.
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