What is CASPer & Advisement Suggestions

Recently I have been getting questions from MCAT students & family/friend advisees on CASPer schools. I did not apply to any places that required one and simply understand it as some sort of personality assessment that gets scored/used in ways that aren't released to the applicant? And I am also under the impression that this is something people actually prep for (MCAT was more than enough test prep fun times for me...)? Basically I've been suggesting to mid/high stats applicants to avoid... What is CASPer & Advisement Suggestions
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums