Abstract
The purpose of this study is to clear relation between self-assessment and performance, and to clear relation between consciousness of not good at making things and self-esteem in junior high school student's consciousness of not good at making things. The results of investigations had cleared the following. (1) There was not significant in performance between student's consciousness of good at making things and consciousness of not good at making things. (2) There was the variation in student's consciousness of good at making things as a function of the increase in performance, consciousness of good at making things decreases gradually with in accuracy and processing speed of work. (3) Self-esteem of student's consciousness of not good at making things was low when compared to consciousness of good at making things, and consciousness of not good at making things was a negative related to self-esteem.
