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The literacy proficiency development is one of concerns in education generally, so is in mathematics education as well. The growth of literacy proficiency is one of the issues in education, because it is very important to problem solving skills in students' real life. This research aimed to describe the growth of lower secondary school and upper secondary school students’ mathematical literacy proficiency in Yogyakarta Special Region province, Indonesia. Three mathematical literacy proficiency aspects were examined in the research, namely content, process and context. It was an exploratory descriptive research with cross-sectional type research design. The population was 1,001 lower secondary school and upper-secondary school students ranging between 13 and 16 years old. They were selected using the combination of stratified and the cluster random sampling technique. A test consisting of 30 items, was adopted from the existing PISA test items used to collect the data in the research. The main data analysis was conducted by estimating students’ ability through the item-response theory approach. The results showed that the mathematical literacy proficiency of the students based on content, context, and process was still low. In the content and context domain, there was progress from 8th grade to 9th, from 9th grade to 10th grade. In the process domain, the development of students' abilities on formulate showed relatively the same results for 8th, 9th, and 10th were around 500, and in the employ and interpret process domain, there was a development of abilities from 8th to 9th, and from 9th to 10th grade. Keywords: mathematics literacy proficiency development, domains based on PISA study.

MATHEMATICAL LITERACY PROFICIENCY DEVELOPMENT BASED ON CONTENT, CONTEXT, AND PROCESS