Final answer:
A requirement for the use of structured reporting in observational studies is a controlled experiment. Structured observation involves observing people while they engage in specific tasks. An example of structured observation is the Strange Situation procedure used to evaluate attachment styles.
Step-by-step explanation:
A requirement for the use of structured reporting in observational studies is a controlled experiment. In a structured observation, people are observed while engaging in set tasks. An example of structured observation is the Strange Situation procedure, which is used to evaluate attachment styles in infants and caregivers. In this procedure, infants' behavior is closely monitored and observed in different phases.