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In any situation , it is the responsibility of the principal investigator to ensure that students and postdoctoral fellows are not diverted from their primary educational mission . A near equal number of Co-Investigators will be selected from proposals submitted by U.S. scientists who have been invited by foreign Principal Investigators to participate in experiments which already have been selected for flight on the Mars ' 94 mission . The ability of the Principal Investigator to select individual projects for both scientific excellence and relatedness to the theme of the program project ( as demonstrated by the included projects ) and actively promote interactions and collaborations . It is the responsibility of the principal investigator to implement measures that will ensure the health and safety of student researchers .