Incident Handling Procedure and Business Continuity Plan

If an incident occurs and need to resolve a danger immediately, execute the Incident Handling Procedure. After that, if there is a business disrupt, execute the Business Continuity Plan.
 
In accordance with the official definition of the ISO 22301-Business Continuity Management Systems, an incident is a situation that might be, or could lead to, a disruption, loss, emergency or crisis. On the other hand, in the standard there is no official definition for “disaster”, but we can consider that is the same or similar to a crisis or emergency. So, an incident can result in a disaster. 
 
Generally, Disaster is related to the concept “Disaster Recovery” (technology), which is not the same that "Business Continuity" (whole organization). If you want to know the differences about this, please read this article “Disaster recovery vs Business Continuity": https://advisera.com/27001academy/blog/2010/11/04/disaster-recovery-vs-business-continuity/