Harvard Law School will allow applicants to take the Graduate Record Examination test as part of a pilot program that could potentially challenge the Law School Admissions Test’s longstanding, national dominance over law-school admissions.

The law school announced Wednesday that applicants seeking to join its entering class of fall 2018 could take either the GRE or the LSAT. Administration officials said they would decide later whether to make the LSAT permanently optional.

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