Madlazim, Nurul Izzah
This study aims to develop 18 items four-tier diagnostic test (4TDT) instrument for Newton's Law of Gravitation concept including sub material Mass and Weight, Gravitational Force, etc., and identify the misconceptions profile of 32 students in 11th grade at SMAN 1 Gresik using the developed instruments. The type of this research is the development research using ADDIE model (Analyze, Design, Development, Implementation, Evaluation). The analyze phase was carried out to determine the importance of developing instruments from various sides. In the design phase, the initial instrument is made according to the results of the analysis in the previous stage. At the development stage, the 4TDT instrument was compiled and tested for its feasibility. In the implementation phase, 32 students were tested to identify their misconceptions profile. The evaluation phase is formative so that it is carried out during the development process. Based on the calculation, the instrument is declared valid by two lecturers validator in the aspects of content, constructs, and language. External validity was carried out by testing the instrument to 20 other students and obtained 15 items valid and reliable. From the misconceptions analysis results obtained, it is known that 87.5% of students experiencing misconceptions on the matter Newton's Law of Gravitation. The percentage of misconceptions experienced by the students in each sub-material ranged from (0-44) %. The highest percentage of misconception occurred in sub-material Gravitational Field. The reason is the student associate Gravitational Field concept with Vertical Upward Motion and Fluid Statics. Students understanding sub-material Kepler's first law well and no students found to experience misconceptions. It can be concluded that the developed instruments are appropriate to be used to identify students’ and their causes. © 2019, Beijing Science Education Innovation center. All rights reserved.
State University of Surabaya, Surabaya, Indonesia
