My area of study is bioinformatics, but I think my question is broadly applicable. I noted that some grad programs have gone GRE-optional, e.g. Harvard BIG, UCSF BI, and UMich CCMB. Some programs like UPenn BGS seem to have gone test blind. Are universities that follow this path just trying to get a wider applicant pool? If so, what's driving this? Do they just want their program to appear more competitive, or are they trying to get a more diverse pool of admitted students? How do test optional programs view students who don't submit GRE scores? It seems odd to me that a program like Harvard BIG makes the GRE optional but strongly recommends that you submit scores. I'd be interested to see what proportion of admitted students didn't submit GRE scores. When I applied to undergrad programs, I applied to three programs that didn't require SAT/ACT scores and was admitted to all without sending in test scores. I'm wondering how much of a gamble not sending in GRE scores to grad programs would be.