When the time comes for a judge or jury to render a verdict in a lawsuit, rarely is there sufficient objective scene data or eye witness testimony to help them determine what happened in the critically deciding seconds of a crash. The purpose of motor vehicle accident reconstruction is to determine what happened at a particular point in time in accidents with respect to drivers, vehicles, objects, pedestrians and others. The Seventh Edition of Motor Vehicle Accident Reconstruction and Cause Analysis provides the novice or experienced attorney, expert witness, and investigator with fundamentals necessary to properly formulate a case, collect critical data, and apply proven engineering concepts in the reconstruction and cause analysis of accidents. The revisions and additions in the Seventh Edition include numerous chapter review questions, hints for expert testimony and report writing, and guidance on when to retain an expert. There are also discussions of case formulation errors and how costly mistakes can be avoided, as well as many MARC1 software applications and analysis of actual crashes, along with a discussion of how a successful resolution of a particular case is most likely to be achieved. The new looseleaf binder design allows the Seventh Edition to become a living document, both in terms of personal use as well as future supplements. Readers using MARC1 Accident Reconstruction Software in their forensic praxis will find the Seventh Edition a helpful tool in effectively using MARC1. MARC1 software applications have been added to make the analysis of complicated calculations an easy and efficient task. The novice lawyer and the expert working his or her first traffic case or the "old pro" will benefit greatly from the experience gained by the author in nearly 350 trial testimonies, 800 depositions, and over 3,000 accident reconstructions.