This report describes a Coupled Rotor/Airframe Vibration Analysis which was developed as a design tool for predicting helicopter vibrations, and a research tool to quantify the effects of structural properties, aerodynamic interactions and vibration reduction devices on vehicle vibration levels. The analysis consists of a Base Program utilizing an impedance matching technique to represent the coupled rotor/airframe dynamics of the system supported by inputs from several External Programs supplying sophisticated rotor and airframe aerodynamic and structural dynamic representation. The Base Program has a stand-alone capability to provide assessment of the effects of changes in airframe dynamics and vibration reduction devices on vehicle vibration levels. The Base Program is too restricted in input support from any particular programs and can be executed interactively from any particular programs and can be executed interactively for many pertinent applications.