Critical incident is the correct answer.
Critical Incident Technique (CIT) is a set of procedures that people use in order to collect direct observation of significant human behavior in order to measure their potential usefulness to develop a specific task. CIT is a great method used at the workplace to identify job requirements, develop recommendations, and determine competencies. When Charlie's supervisor puts a note in his file to help her remember his efforts during his performance evaluation, she is adopting the critical incident technique.
