The Professor was recently asked for real life examples or best practices for the criteria that organizations have used to define major incidents. ITIL defines a major incident as an incident that results in significant disruption to the business and so real world examples are going to vary from one business to the next. For a financial services company, for example, a major incident could be an incident affecting live money transactions. For a retail company, a major incident could be an incident affecting its point of sale service. For a manufacturing company, a major incident could be an incident that affects the production line. Simply put… real dollars are being lost. A major incident could also be a service outage that affects are large number of users. Those users could be your company’s external customers, or it could be your internal employees. So for many organizations, outages affecting the company’s web site, or its email or customer relationship management (CRM) service