Specifically, this article introduces ideas that should be considered when developing a machine and lubrication practices diagnostic program based on oil analysis, including: * Defining a test profile for industrial machines, aka the test slate. * Differentiating between primary and secondary tests. * Identifying primary test methods, their purpose and benefits. * Identifying secondary tests, their purpose and benefits. The Particle Quantifier (PQ) and Direct Reading (DR) Ferrography methods are both appropriate for routine and exception testing to identify the onset of aggressive wear, and to project increases in the rate of the problem. Since the readings differ, it is best to determine and standardize to the test of choice.