If you were to sit in a local fast-food restaurant and record what people ordered, you would be using "naturalistic observation descriptive method".
When utilizing naturalistic observation, researchers gather data about subjects by watching them unpretentiously, without interfering with them in any capacity. Analysts make a record of occasions and note connections among those occasions. With naturalistic perception, specialists confront the test of getting an unmistakable perspective of occasions without getting to be detectable to the subjects.