The capacity in which a person is determines how he or she is able to monitor a contract. Several people may be having different skills, however some individual may be having several varying skill which may be a great benefit to a contract. This is because the several skills may be useful hence reducing the capacity of participants.
Several contract are scheduled to different mission. Therefore, it cannot be compared for the case where a person is doing science research with the other one doing basic research. It is common that the science mission may involve a large number.