District court is a state or federal trial court.
I believe the answer is: qualitative techniques.
qualitative techniques refers to the techniques that is used in order to obtain the data that are not measurable by numbers (such as emotions, body language, principles, etc). Because of this lengthy interview or direct observations often became the most preferred methods to obtain such data.
Pros: He will help with climate change Cons: He may not have the nicest personality
Serfs were ranked somewhere near the bottom of the class system, just above slaves. They were peasants who were free, but were workers on territories owned by the feudal lords.