Most dynamics people think of structural testing as the system vibration study of large structures like automobiles, aircraft or civil structures.  However, the ever increasing push for smaller, lighter, and more powerful in the mobile electronics world (phones, disk drives, subnotebooks, etc) creates a unique set of challenges for structural test engineers. First and foremost is often simply finding space to locate a response accelerometer!  This article discusses a number of other specialized measurement considerations for ultra-small or ultra-light test structures...