The NBAC looks at characteristics individuals might have that would prevent them from being able to provide voluntary informed consent. The traits may be thought of as falling into six broad areas: cognitive or communicative, institutional, deferential, medical, economic, and social. Prospective research subjects who are not able to comprehend information, deliberate, and make decisions about participation in a proposed research study have a. a. Physical vulnerabilityb. Cognitive or communicative vulnerabilityc. Economic or social vulnerabilityd. Institutional vulnerability