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This study investigated the impact of scoring polytomous items later on measurement precision, classification accuracy, and test security in mixed-format adaptive testing. Utilizing the shadow test approach, a simulation study was conducted across various test designs, lengths, number and location of polytomous item. Results showed that while scoring polytomous items later had a statistically significant impact, the magnitude was generally small. Measurement precision and test security indices were slightly higher when polytomous items were scored after the adaptive test. Classification accuracy indices were minimally affected. These findings suggest that the practical significance of the impact may be limited in operational settings. However, test developers should still consider factors such as test design, test length and other item configuration when implementing mixed-format adaptive testing. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]