If the first method of data collection is to conduct an interview, what is the second method?

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E6 Nursing Fundamentals Taylor pp. 434-436, 433-435
E6 Nursing Fundamentals Potter Perry 12e Part 1 p. 245-247
Practise the full DSSSB Public Health Nurse - 2015
Attempt every question from this paper in a timed mock, then review the full solution for each one.