This guide outlines an effective methodology for writing the experimental laboratory report, showing how skills that emphasize correct grammar and appropriate style must be adapted to writing reports with a purpose--reports that emphasize structure and content to persuade the readers. It first covers basic principles; then explores each section of a report, step-by-step, with sample report sections and critiques. The Laboratory Report Writing Process. Principles of Clear Lab Report Writing. Rules of Practice for Lab Report Writing. Graphics. The Title Page and Table of Contents. The Beginning of the Report. The Body of the Report. The Ending of the Report. A Sample Student Lab Report. For anyone who must write lab reports as part of their professional responsibilities.