I am not clear on the difference between an evaluator and an external evaluator. For the survey I am creating, three different roles (intern, mentor teacher, manager) will be evaluating a fourth role (field instructor), and the first three will never be evaluated themselves. I don't want to manually go through to mark a few hundred people as external evaluators if it's not necessary. Is there really a reason to mark someone as an external evaluator? Is there a way to do this through the import? Are there consequences for not marking someone as an external evaluator if they should be?