Distribution tracking involves monitoring the distribution of documents or products within a specific geographic area. Typically, this is done by contacting a sample of households by phone to verify if they received the materials and on what date. Generally, this verification is outsourced to a third-party company independent of the distributor when the goal is to guarantee service quality. However, the distributor may also perform this tracking internally to ensure proper distribution. Some companies even offer real-time tracking using GPS technology.