The document provides guidance on writing short and long formal reports. It discusses the key characteristics and components of short reports, which should be 2-3 pages and focus on conclusions and recommendations. Short reports require less background information and a more personal writing style. Long, formal reports include prefatory sections like a title page and table of contents, as well as an executive summary, introduction, main body, and ending with a summary, conclusions, and/or recommendations. The report also provides examples of short reports and components of long, formal reports.