Precis writing is an art that requires extracting key information from a document and conveying it concisely. An effective precis is roughly one-fourth the length of the original and preserves the original's logic, emphasis, and main examples. Writing a precis demonstrates that you have assimilated the key information and provides a record to review material for the long term. The process of writing a precis involves identifying the reader and purpose, underlining key ideas, writing a summary of each paragraph, and revising the precis.