The objective of the study was to examine the
use of instructional module of service firm accounting to increase the learning
mastery of eleventh graders of SMA Wachid Hasyim 2 Taman. The classroom action
research consisted of two cycles. The data collection techniques were
observation, test, and documentation. The data were then analyzed through
cyclical reflections. The result of the study showed that through the use of
instructional module, the studentsÂ’ and teachersÂ’ instructional activities
improved. Additionally, all students in the designated class achieved the
learning mastery.
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