The purpose of this case study was to determine teachers' rationales for assigning students with mild disabilities to alternate assessment based on alternate achievement standards (AA-AAS). In interviews, special educators stated that their primary considerations in making the assignments were low academic performance, student use of extended standard modifications, and the inflexible 1% cap. None of the teachers provided their students with grade-level content or appropriate modifications. Some students were competent in grade-level reading, but were assigned to the 2010 AA-AAS because read-aloud accommodation is not permitted in the reading passages of the general assessment. Findings raised concerns about the susceptibility of eligibility guidelines to lead to subjective decisions. Future research, implications of these findings, and limitations of the study are discussed.