Participant is authentic. All clothes and accessories are either original to the period or museum quality reproductions. Participant actions and speech are in character with the benefit of Hollywood stereotypes. This is the level of authenticity to reach and maintain. First Person Impression.
Participant knows their history, what they do in their daily lives, and know the issues of the time.
Political correctness is acceptable for the period in question. This is the level of authenticity to strive for.