This document provides guidance on writing letters of inquiry. It discusses the purpose of inquiry letters, which is to seek information from prospects or companies. It outlines the key components of an effective inquiry letter, which are: 1) Stating the reason for the inquiry 2) Explaining the specific information needed and its potential uses 3) Stating the expected course of action from the reader It also notes that inquiry letters should be courteous, brief, complete, and direct. Finally, it identifies the typical parts of an inquiry letter as the orientation, information request, desired action, and expression of goodwill.