Use a tape recorder only with consent of the witness. Use sketches and diagrams to help the witness. Label hearsay accordingly. Do not argue with the witness. Accident Analysis Accidents represent problems that must be solved through investigations.
Formal procedures are helpful in identifying and solving problems.
As its name implies, this technique emphasizes change. To solve a problem, an investigator must look for deviations from the norm. Consider all problems to result from some unanticipated change. Make an analysis of the change to determine its causes. Specify what was and what was not affected.