Feasibility of APOS Theory-based Mobile Module to Improve Students Spatial Ability
Henry Suryo Bintoro, Y.L Sukestiyarno, Mulyono, Walid

Universitas Negeri Semarang

Abstract

Spatial ability plays an important role in making representations of geometric problems so that it has a basic role in the success of understanding the basic concepts of geometry. Students do not yet have maximum representational abilities. Action-process-object-schema (APOS) theory is used to trace students^ thinking processes in solving geometry problems. The purpose of this study was to obtain the results of developing a mobile module based on the APOS theory to improve students^ spatial abilities that were valid. This study uses research and development methods with the Borg & Gall model. The research data was obtained from a validation questionnaire of material experts and media experts. The type of data generated is qualitative data which is analyzed using the assessment criteria guidelines to determine product quality. Based on the results of the assessment from the validator, the criteria for the average value of the feasibility test for the APOS theory-based mobile module material are very valid by material experts and the APOS theory-based mobile module feasibility is very valid by media experts. These results indicate that the APOS theory-based mobile module teaching materials that have been developed are declared valid or feasible to use.

Keywords: APOS Theory, geometry, mobile module, spatial ability

Topic: Mathematics Education