Gorontalo local language learning for early childhood is one of the ways to preserve the local language of the Gorontalo region as one of the regional cultural treasures of Gorontalo. Because of the unique characteristics of early childhood, the local language learning in early childhood needs to be carried out by competent teachers. The second phase of research has produced some guidebooks for Gorontalo local language learning for early childhood, which consists of four books, namely: (1) book 1: Gorontalo Local Language Learning Program for Early Childhood, (2) book 2: Teacher’s Handbook, (3) book 3: Teaching Material, and (4) book 4: Evaluation Guidebook. This third phase research was conducted to examine the effectiveness of the guide in improving the competency of teachers of Early Childhood Education to carry out Gorontalo regional language learning for early childhood. The test uses a quasiexperimental method with one group pre-test and post-test design. Data was collected using test techniques. Data analysis was carried out using the t-test. Based on the results of data analysis, the value of t-score obtained was 6.7366, and from the t Distribution Table at the 5% significance level, it was obtained that t0.975 (19) = 2.0930. It shows that the tscore value is greater than ttable, so, it can be concluded that the null hypothesis H0 is rejected and the H1 is accepted. It means that there is an influence of guidebooks on teacher’s competency in implementing Gorontalo local language learning for early childhood. In other words, the guidebooks for the Gorontalo local language learning that has been developed has proven its effectiveness in improving teacher competency in carrying out Gorontalo local language learning for early childhood.

Keywords : Handbook, Competency.