Final answer:
The first and foremost responsibility of the Interim Safety Investigation Board is to guarantee the safety of the participants during a study or investigation.
Step-by-step explanation:
The first responsibility of the Interim Safety Investigation Board is to ensure the safety of their participants during a study or investigation.
This means that the board must prioritize the well-being and security of the individuals involved and take appropriate measures to minimize risk and prevent any harm or accidents.
For example, if the investigation involves testing new aircraft equipment, the board will need to ensure that the participants are knowledgeable about the potential risks and provide informed consent before participating.