The correct answer is; The Delphi technique.
Further Explanation:
This technique was founded between 1950 and 1960, it was developed by a project called RAND. This project was begun by three men named Norman Dalkey, Nicholas Rescher, and Olaf Helmer.
This technique involves sending out random questionnaires to people that are experts in their field and getting their responses. All responses are anonymous to the researchers. When the responses are received they're aggregated and shared with the others in the group study.
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Economic influences I believe
When did you first notice your child acting different.? How long has this beem going on? What is the las thing thwy ate or drank. Do they have any illnesses that you know of and if so are they on medication now for it. how much do you dose your child for their.condition.
These things can lead to people feeling those certain feelings
Depression
Anxiety
Stress
Not enough nutrients
Sleep deprived