Final answer:
The scenario represents the use of the '5 Whys' tool for identifying problems in a social work context.
Step-by-step explanation:
The scenario described represents the use of the '5 Whys' tool for identifying problems. This tool is commonly used in problem-solving and root cause analysis to delve deeper into the underlying issues. By repeatedly asking 'Why?' in response to the girl's answers, the social worker aimed to uncover the root causes of the girl's trouble with bullies in school.