Konsepsi siswa pada konsep gaya merupakan hal penting untuk menunjang proses pembelajaran di kelas. Oleh karena itu, diperlukan suatu instrumen tes diagnostik yang dapat mendiagnosis level konsepsi siswa pada konsep gaya. Hal inilah yang mendasari peneliti mengembangkan instrumen Force Conceptual Inventory (FCI) dalam format four-tier test (tes empat level). Tujuan penelitian ini disusun sebagai langkah awal pengembangan FCI berformat four-tier test sebagai salah satu instrumen tes diagnostik pada konsep gaya. Metode penelitian menggunakan desain Plomp dengan tahap (1) Investigasi Awal, (2) Desain, (3) Realisasi/Konstruksi, (4) Tes, Evaluasi, dan Revisi, (5) Implementasi. Instrumen yang dikembangkan diujicobakan pada 30 siswa di salah satu SMA Negeri di Kota Bandung. Hasil penelitian ini diperoleh bahwa instrumen tes diagnostik FCI berformat four-tier test yang dapat mendiagnosis level konsepsi siswa pada konsep gaya. Dengan demikian, hasil pengembangan FCI berformat four-tier test ini berpotensi untuk dijadikan salah satu instrumen tes diagnostik yang dapat mengungkap miskonsepsi.

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Abstract.Conceptual understanding is one of the most important aspects in the study of Physics because of it useful to understand principles behind certain phenomenon which happened. An innovative method was needed to strengthen and enhance student's conceptual understanding, especially regarding the abstract subject such as magnetic field. For this reason, worksheet and exploration sheet based on PDEODE*E (Predict, Discuss, Explain, Observe, Discuss, Explore, and Explain) that uses Gauss Meter application as the smartphone technology has been designed to answer the problem. The magnetic field strength in different mediums is the physics subject which covered in this research. The research was conducted with the aim to know how effective smartphone technology-based PDEODE*E could be implemented as a physics learning strategy. The result of this research shows that students could show improvements in conceptual understanding that shown by the conclusion that was constructed during the learning process. Based on this result, PDEODE*E could become a solution to strengthen students' conceptual understanding regarding physics subject, especially those that requires abstract thinking. This result also has shown that the application ofsmartphone technology could be used to support physics learning processes in the classroom, such as Gauss Meter in this research which used to measure the magnetic field, Light Meter which could be used in the concept of light, and Harmonicity Meter for the context of the sound wave.