Public speaking coaches provide, often private, instruction to clients in theory and techniques on how to improve their public speaking skills. They identify each client's strengths and weaknesses and tailor their instruction to their specific needs, which may include improving the client's vocal delivery, articulation, presentation abilities and body language. Depending on the background of the client, be it business, education or otherwise, public speaking coaches also instruct clients or students in persuasive arguing, rhetorical delivery and other debating techniques.