<![CDATA[This research was motivated by the importance of developing teacher professionalism through collaborative activities, one of which is carried out through the Teacher Working Group (KKG). This study aims to determine the description of the implementation of the Teacher Working Group (KKG), the level of teacher professionalism, and the influence of the Teacher Working Group (KKG) on teacher professionalism in Cluster 2 Rappocini, Makassar City. This study employed a quantitative approach with an ex post facto research design. The population of this study consisted of teachers in Cluster 2 Rappocini, Makassar City, with a sample of 57 teachers. Data were collected using questionnaires, while data analysis was conducted through descriptive statistics and simple linear regression analysis assisted by JASP software.The results showed that the Teacher Working Group (KKG) variable obtained an average score of 2.523, while the teacher professionalism variable obtained an average score of 2.567. The results of the simple linear regression analysis indicated that the Teacher Working Group (KKG) had a positive and significant effect on teacher professionalism with a significance value of <0.001. Furthermore, the coefficient of determination (R Square) of 0.571 indicated that the Teacher Working Group (KKG) contributed 57.1% to teacher professionalism, while the remaining percentage was influenced by other factors outside the scope of this study. ]]>
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