Computer Algebra System, Change of Students' Rationale and Writing
IN KYUNG KIM
Korea National University of Education
Adopting the perspective of activity theory, Mellin-Olsen(1981) argues
the case for the significance of a student's rationale for engaging in
classroom activity. He identifies two rationales for learning. These
are the S-rationale (Socially significant) and the I-rationale
(instrumental). And then, Goodchild(2002) adds the P-rationale
(practice) and the N-rationale (no rationale). First, this study
surveys the student have which one of four rationales. After students
use Computer Algebra System in class, this paper investigates to change
Ball & Stacey(2003) say what should students record when solving
problems with CAS. They say that record need reasons, information, the
plan, and some answers. Based on this theory, I teach to use Computer
Algebra System and to write their answers in class. After students
received that class, this paper investigates to change students'
writing by assessment.
The subject is one class of an urban high school. First, I had an
interview with their classroom teacher and mathematics teacher briefly.
And then, I taught that class using Computer Algebra System. That class
carried out four times. It took one hour each time. I did assessment to
students and investigation to students' rationales using a
questionnaire before and after whole class.
The result showed significant change about students'
rationale and writing. Significant numbers of students change to
S-rationale. After those classes, several students have good attitude
though they didn't have it before that class. And several students'
writing also change for the better.