Final answer:
A Post-Incident Assessment is used to collect information and prepare a detailed report after a significant incident, to evaluate the response and improve future plans.
Step-by-step explanation:
The Post-Incident Assessment (PIA) is typically used for significant incidents that require a concerted effort to collect information from multiple sources in order to prepare an official written report. This report often includes analysis of the incident, evaluation of the response, and recommendations for future improvements. A PIA is a critical tool for organizations to understand what happened during an incident and to develop strategies to improve their incident response plans.