This document outlines a research study that aims to improve natural science learning outcomes for 3rd grade students at a primary school in Indonesia. It will do so by implementing a guided discovery learning approach. The study will use a classroom action research methodology involving two cycles of planning, implementation, observation and reflection. Data will be collected through observation, tests and documentation, and analyzed both qualitatively and quantitatively. Success will be measured by whether 75% of students achieve a natural science score above the passing threshold, which currently only 65% do. The guided discovery approach is expected to help increase student outcomes by making learning more active, student-centered and linked to real-world examples.