They are divided into three types: commodity, service, and technology contracts. 1  Commodity contracts include fuel, vehicles, office supplies, and food. 2  Elevator maintenance is an example of service contracts. 3  Technology contracts include hardware, software, telecommunications, and IT services.
Relevance is ordinarily a necessary condition, but not a sufficient condition, for the admissibility of evidence. For example, relevant evidence may be excluded if its tendency to prove or disprove a fact is heavily outweighed by the possibility that the evidence will prejudice or confuse the jury.
Study relevance limits generalizations. The relevance of a study depends on how much the conditions under which it is done resemble the conditions of the issue under consideration. For example, there are limits to the generalizations that one can make from animal or laboratory experiments to humans.