This report describes a technique to be used in interpreting the data obtained from the use of deposition pins in combustors. The discussion illustrates the potential problems associated with the use of deposition pins and the failure of many investigators to perform rigorous analyses of the aerodynamics and multiphase flow surrounding the pins. The technique outlined in this report for interpreting deposition pin data is fairly sophisticated but does not address all of the problems associated with such an analysis. This report specifically addresses the interception of entrained particles by the pin as a result of inertial impaction. Other forces such as diffusiophoresis and thermophoresis, which are most important for particles that are one micron diameter or smaller, are not considered. The primary goal of the report is to demonstrate the significance of the interception probability of a pin for entrained particles of specific sizes. The potential interception of entrained particles by a pin or component is only the first step in understanding deposition. Once the particles have arrived at the surface, those mechanisms that are responsible for adhesion dominate the deposition phenomenon. While little data is currently available on particle adhesion for combustion conditions, an in-house METC project is underway to measure the sticking coefficient of residual coal particles as a function of coal type and combustion parameters. Based on the understanding of adhesion mechanisms, improved methods of preventing or removing deposits may result. 11 refs., 19 figs., 9 tabs.