Search

This study aims to obtain an overview of the obstacles and learning obstacles of Indonesian high school students on the problem of geometric sequences. The research used descriptive qualitative. Data of the research was obtained from the results of test and interviews given to fifty students from one of the senior high-school in West Java. The test is given consists of four questions related to problem of geometric sequence. The answer to the questions were confirmed again by clinical interview. These data are analyzed based on the framework of learning obstacles to the students answer. The obstacles obtained through the test of questions include students still having difficulty in determining the sequence, ratio, the value of the nth term, and the number of the nth term. The results showed that there are still many students who experience learning obstacles on learning geometric sequences. Learning obstacles that occurs includes ontogenic obstacles, epistemological obstacle and didactical obstacles. [ABSTRACT FROM AUTHOR]

Proleco-DDR is intended to develop teacher professional knowledge through the implementation of a professional learning community network by applying a didactical research design. This study was intended to find out how teachers' professional knowledge develops through the implementation of Proleco-DDR in West Java. This study was a qualitative study with a hermeneutic phenomenological approach. The participants involved in this study amounted to 42 people consisting of mathematics teachers, school principals, and junior high school supervisors in West Java. Based on the results and discussion, Base on the results and discussion, it can be concluded that mathematics teachers, principals, and supervisors of junior high schools need to enhance the capacity to innovate in the teaching and learning process through a series of teacher research on constructive and productive professional practice. To develop teacher professional knowledge, the Proleco-DDR implementation framework is implemented through reflective practice mechanisms, argumentative dialogue, narrative writing and collaborative-colleague relationship. Furthermore, metapedadictic framework and DDR is intellectual tools in the Proleco activity system for junior high school networks. teacher in West Java. [ABSTRACT FROM AUTHOR]