This is a test of commonsense. Complete the next sentence:

How to conduct a time and motion study
Use work sampling if you have limited time to record.
In this approach, you observe the person at certain times rather than continuously. The intervals can be regular or random.
You observe the person for a given time, and then extrapolate from the samples how much time is spent on each task. This type works better on tasks that have fewer components or workers that do fewer tasks overall.