This document discusses Retail Chemist Prescription Audit (RCPA) which is a process used by pharmaceutical sales representatives to gather prescription data from chemists and doctors. The key steps in RCPA include identifying potential customers, assessing their prescription preferences and shares, and maintaining a core doctor list. RCPA facilitates effective product promotion by helping reps detail the right products, sample the right products, and give the right information to validate their support. RCPA involves choosing the right chemist and time to visit, asking open-ended questions, and tabulating prescription data to develop call strategies and convert information into quantifying prescription demand.