The development of RBL-STEM learning materials to improve the student’s forecasting thinking skills to solve resolving efficient dominating set problem

Forecasting thinking skills are the ability to apply the scientific method in understanding, predicting, discovering knowledge effectively problem. The Indicators of forecasting thinking skills include and identifying the solving characteristics of problems, using patterns recognition for prediction, expressing any possibility in situations that have not been observed. The thinking skills are not possed optimally by students. The aims of the research is to develop of RBL-STEM learning materials to improve the student's forecasting thinking skills to solve resolving efficient dominating set. The research shows that learning materials that have been developed must obtain valid, practical, and effective criteria. The average score for each aspect obtained on validity, criteria in this study is 3.5 for format validity, 3.6 for content validity and 3.5 for writing format validity. The score on the practicality aspect in this study is 3.8 for media format and 3.9 for language and writing on media. While the effectiveness scores in this study is 85% for student learning achievement test results, 95.5% for student activity results and 81.8% for student response results.