1. A non-transitory computer-readable medium storing instructions that, when executed by a processor, are configured to cause the processor to perform operations for grading an electronically administered assessment, the operations comprising: displaying a first challenge problem; displaying a digital ink stroke corresponding to an answer to the first challenge problem from a first assessee; receiving, from an assessor via a digital pen, a first feedback tag for association with the digital ink stroke of the first assessee; electronically tagging the digital ink stroke of the first assessee with the first feedback tag made by the assessor via the digital pen; identifying a second digital ink stroke corresponding to an answer to the first challenge problem from a second assessee that matches the electronically tagged digital ink stroke of the first assessee; automatically tagging the matched digital ink stroke of the second assessee with the first feedback tag made by the assessor via the digital pen, wherein each digital ink stroke comprises a notation spatially defined relative to the first challenge problem; and removing the automatically tagged and matched digital ink stroke of the second assessee from a set of answers still requiring assessment by the assessor.