VALIDITAS DAN PRAKTIKALITAS PENGEMBANGAN LKPD BERBASIS PROBLEM BASED LEARNING PADA MATERI SISTEM IMUNITAS UNTUK MENINGKATKAN KEMAMPUAN BERPIKIR KRITIS PESERTA DIDIK KELAS XI SMA
This study aims to develop problem-based learning worksheets based on the material of the Class XI Immunity System which is suitable to improve students' critical thinking skills that are valid, practical, and effective. LKPD is a teaching material that contains material and evaluation questions that have been prepared in such a way that students are expected to be able to study the teaching material independently. LKPD based on problem based learning to train and develop the ability to solve real problems in the presence of stimuli and responses from students so as to gain knowledge as well as important concepts related to the material. D Thiagarajan and Semmel.Based on the results of research and development of the results of the validity of the LKPD based on problem based learning, it is stated 84,25% to be "very valid" from the material and media aspects. For the results of the practicality of problem-based learning-based worksheets, it is 88% stated "very practical". Next for the effectiveness of problem-based learning-based worksheets is declared 85,3% effective based on student learning outcomes with the category of "high" improvement. With these results, problem-based learning worksheets based on class XI immunity system material that are suitable for improving students' critical thinking skills are declared valid, practical and effective for use by class XI high school students.