Özet:

This study aimed to develop a textbook for fourth grade elementary school students. This research applied research-and-development model adapted from Borg & Gall. The developmentinvolved the following steps (1) initial research and information gathering, (2) textbook planning, (3) product validation testing, (4) product revision, (5) product testing. The research data was obtained through documentation, interviews, questionnaires, validation sheets and learning achievement tests after a product trial had been carried out with 2 classes, namely the experimental class and the control class. The data were then analyzed using the t-test technique and the relative effectiveness test. The results of the independent t-test obtained t value -5.551 and showed significant differencewith p 0.000. The significance value was smaller than α value (0.05). This means that there is an average difference between the control class and the experimental class. The calculation of the relative effectiveness obtained a value of 57.24%, so it can be concluded that the textbook developed have a relative effectiveness level of 57.24% compared to the previous textbook.

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