Pengembangan Instrumen Diagnostik Berbasis Motif Tenun Ikat Dayak Sintang untuk Memetakan Level Berpikir Van Hiele

Abstract

Students’ geometric thinking ability requires diagnostic assessment capable of identifying students’ positions within the Van Hiele hierarchy and providing information for instructional planning. This study developed a diagnostic instrument based on Sintang Dayak Ikat weaving motifs as contextual stimuli to map junior high school students’ Van Hiele levels of geometric thinking. The study employed the ADDIE development model. Data were collected through cultural exploration, expert review, diagnostic testing, scoring by two raters, and practicality questionnaires. A limited trial involved 32 students. The six essay items obtained item-total correlations ranging from 0.563 to 0.861, a Cronbach’s Alpha coefficient of 0.81, and an inter-rater reliability coefficient of 0.988. Five items were categorized as moderately difficult, while one item was categorized as difficult; one item showed excellent discrimination power, four items showed good discrimination power, and one item showed adequate discrimination power. The practicality of the instrument reached 72.66% based on students’ assessments and 71.15% based on teachers’ assessments. The mapping results showed that students were at the Pre-Level 0 (9.38%), Level 0 (34.38%), Level 1 (43.75%), and Level 2 (12.50%). These findings indicate that the instrument has the potential to be used diagnostically to map students’ geometric thinking levels, although further testing on a larger scale is needed.