This document provides information about writing inquiry and response letters. It defines an inquiry letter as a letter written to request information or ascertain authenticity. It then lists strategies for writing inquiry letters, such as stating the reason, question, and inducing a response. Characteristics of inquiry letters include conciseness, courtesy, and specificity. The document also provides strategies for responding to inquiries, such as appreciating the sender's interest and providing detailed information and willingness to assist further. An example response letter demonstrates these strategies.