Zulfahmi^1,, Edi Syahputra¹, Kms. M. Amin Fauzi¹

This research aims to describe: (1) product validity of learning device development based on Van Hiele model, (2) the practicality of product development of learning device based on Van Hiele model, (3) the effectiveness of product development of learning device based on Van Hiele model, (4) improvement of students' spatial skills by using the tools that have been developed based on Van Hiele model, (5) increase the ability of self-concept students by using the device that has been developed based on Van Hiele model. The research was a development research. The development model was used 4-D model consisting of four stages, namely: Defining, designing, developing and distributing. The study to test trials was conducted on the class VIII of MTsS Ulumuddin. Test trials 1 conducted on the class VIII-2 and test trials 2 was conducted on the class VIII-3. Based on the results of the development it¡¯s showed that: (1) The valid learning tools developed with the total average validity of RPP¡¯s score was 4.50, Student Book¡¯s score was 4.30, Master Book¡¯s score was 4.30, and LAS¡¯s score was 4.40; (2) The practical learning tools developed showed based on students¡¯ activities within the prescribed tolerance limits; (3) The effective learning tools developed can be seen based on from the students' learning completeness in the classic, and achievement of learning objectives of at least 80% (4) The average achievement of students' spatial ability in the trial I was 3.15 increased to 3.51 in trial II; and (5) The average achievement of students' self-concept trial I was 3.03 increased to 3.16 on trial II.

learning tools development, Van Hiele model, spatial ability, self-concept