Book excerpt: Since 9/11, the profession of intelligence has come under increased scrutiny. Written products have been criticized for lack of clarity or for unconvincing arguments. Nations have gone to war based on what was considered the best available intelligence, only to learn later that it had been flawed. A lack of standards for written products across the Intelligence Community has adversely impacted those products and those who depend upon them. Writing Classified and Unclassified Papers for National Security is designed to serve as a style guide for those in the intelligence profession and for those aspiring to that career and pursuing studies in intelligence, national security, homeland security, or homeland defense. It provides essential information and guidelines regarding the preparation of written products to satisfy the intended consumers. This desktop reference is essential for career intelligence professionals and as a reference book for students.