Abstract
Scientific literacy embodies the essential scientific knowledge and skills that students require for comprehending and applying scientific concepts in their daily lives. This study aimed to design an assessment tool for gauging elementary school students' scientific literacy. Adopting the Research and Development (R&D) approach, this study incorporates a 3D (Define, Design, and Develop) framework. The scientific literacy indicators devised encompass the ability to explain phenomena scientifically, evaluate and design scientific inquiry, and interpret data and evidence scientifically. The outcome of this research manifests as a Scientific Literacy Instrument comprising six open-ended questions accompanied by alternative answer schemes. The appropriateness of all items demonstrates a moderate level of validity. The reliability of the test items indicates a commendable degree of consistency. The complexity of the questions ranges from moderate to challenging. The discriminating power of each item indicates a noteworthy level of differentiation. Thus, the scientific literacy assessment tool formulated in this study serves as an effective means of evaluating students' scientific literacy in the context of elementary school science education.