Development of Realistic Mathematics Learning Devices with Problem Based Learning Models for Teaching Tube Materials

This article contains a report on the process and results of development research that aims to describe the steps for developing realistic mathematics learning tools with a Problem Based Learning model to teach Tube material at the junior high school level. The learning tools developed include Learning Implementation Plans (LIP), Student Worksheets (SW), and Learning Outcome Evaluation Instruments (LOEI). The process of developing the learning device was carried out using a 4-D model (Thiagarajan, et al, 1974) which was modified by not applying the Disseminate stage (Trisna, 2006). The assessment of the results of device development is based on Nieveen's (1999) criteria which include Valid, Practical, and Effective criteria.Through the first 2 (two) stages of the 4-D development model, namely the Define and Design stages, a document package has been produced consisting of 3 (three) LIP, 3 (three) SW and 1 (one) LOE instrument called Draft A. -3 of the 4-D model is the Develop stage with the main activities being expert validation and field trials to obtain data about the practicality and effectiveness of the developed device. Validation was carried out 2 (two) rounds because in the first validation, the 3 devices did not meet the valid criteria. The trial was carried out on grade IX students of Tawaang Christian Middle School in 2 (two) rounds because the assessment of practicality and effectiveness aspects in the first round had not reached the criteria. At this stage we get a valid, practical and effective learning tool to teach Tube material for Class IX SMP students.