There are many techniques available for diagnosing probable root-cause of vibration that adversely affects the reliability of an asset, including time waveform and frequency analysis, natural frequency testing, operating deflection shape (ODS), vibration video amplification (VVA), and finite element analysis (FEA). Once the source of a vibration problem has been diagnosed, a Corrective Action Plan must be developed and implemented. Vibration control methods include force reduction/elimination, resonance tuning, damping and dynamic vibration absorbers. Case studies are used to illustrate the use of these diagnostic and control methods in reducing vibration, increasing fatigue life, and increasing the reliability of mechanical equipment and structural supporting systems.