Book excerpt: "Critical Thinking through Writing" is an essential book for all intelligence officers, analysts, and managers who want their intelligence to be read and understood. Drawing on his extensive CIA and teaching experience, David Cariens offers salient lessons in writing, critical thinking, and ethics. The English language is complex and this book offers practical instruction designed specifically for intelligence personnel. The writing and analysis exercises are invaluable and will improve the skills of any analyst, regardless of their prior experience. With the knowledge from this book, intelligence personnel will ensure their message is clear and concise. --Aaron Clack, Division Criminal Analysis Section Manager, Royal Canadian Mounted Police