Introductory Concept mapping is a method that property of association task is introduced to Concept Mapping. With a certain extent of freedom permitted to experiment participants for association, the method is advantageous in that motivation of participants to construct maps is enhanced higher than Concept Mapping. Experiment participants are supposed to write down concepts which are associated from the concept of developmental psychology around the word, “developmental psychology”, written on a white paper. In an examination of correlation coefficient based on this method using score of intra-concept relation explanation as a dependent variable and previous (existing) knowledge score, number of mean expressed concepts, number of bifurcated concepts, number of cross-links, and number of forward reactions as independent variables, significant positive correlation was observed with all independent variables except for the number of cross-links. In addition, only number of bifurcated concepts and previous knowledge score remained as reasonable independent variable by a multiregression analysis performed based on stepwise way.