There is an extensive list of categories that can be specified as riddor dangerous occurrence in a workplace. RIDDOR refers to Reporting of Injuries, Diseases, and Dangerous Occurrences Regulations, where a dangerous occurrence is specified as a Schedule 2 RIDDOR. The importance of RIDDOR lies in enforcing transparency between companies and the Health and Safety Executive, ensuring that workplaces comply with health and safety protocols. You can learn about RIDDOR in site supervisory courses at the College of Contract Management and become a fully qualified site manager.