This document describes a test method to determine the percentage of flat, elongated or flat and elongated particles in coarse aggregate. The test involves sieving the aggregate sample into different size fractions, then measuring and classifying each particle as flat, elongated, or neither. Calculations are done to determine the percentage by mass or count of particles in each category. A sample must be large enough according to the maximum nominal size, from 1 kg for 3/8" up to 500 kg for 6". The percentages found are compared to limits for construction applications.