Your introduction and hypothesis establish a strong scientific foundation for the investigation because you accurately defined both osmosis and water potential and then translated those concepts into a directional, testable hypothesis. This level of conceptual precision is a clear strength within the Exploration criterion, as it shows that you understood not only the biological theory behind the experiment but also how to structure an investigation around a measurable variable relationship. In particular, your identification of sucrose concentration as the independent variable and change in mass as the dependent variable demonstrates secure experimental design thinking at IB SL level. The report also communicates your method clearly and logically, which supports the Communication criterion and allows the reader to follow the investigation without ambiguity. The most significant limitation in the report appears in the Analysis and Evaluation sections. While your percentage change in mass calculations were largely accurate, the processing of uncertainty was incomplete because the mean values were presented without propagated uncertainty, and the graph used standard deviation error bars rather than the uncertainty range required by the IB mark scheme. In addition, your evaluation correctly identified temperature fluctuation, surface area inconsistency, and balance precision as methodological issues, but all three were classified only as random errors. Distinguishing which errors are systematic versus random is essential because each type affects reliability and validity differently. Your conclusion also references osmosis appropriately, but it stops short of explicitly connecting the results to water potential gradients and tonicity, which weakens the biological interpretation expected for higher-band Evaluation marks. Before your next IA draft, create a short checklist specifically for quantitative processing: uncertainty propagation, correct error bar selection, and explicit classification of each limitation as random or systematic. When writing conclusions, include at least one sentence that explains results using subject-specific terminology such as water potential and isotonic or hypertonic conditions. Developing these analytical and evaluative skills will be especially important for future IB practical assessments because higher mark bands reward not only accurate data collection, but also the precision with which you interpret uncertainty and connect evidence to biological theory. Your current report already demonstrates the conceptual understanding needed for a 20+ level response once the technical analysis requirements become more rigorous and consistent. **📊 Feedback Rationale** * **Specific strength cited:** Accurate explanation of osmosis and water potential alongside a directional, testable hypothesis linked to the Exploration criterion. * **Specific gap identified:** Missing uncertainty propagation, incorrect use of standard deviation error bars, lack of random/systematic error distinction, and omission of water potential and tonicity in the conclusion. * **Feed-forward action recommended:** Use a quantitative analysis checklist and consistently integrate IB biological terminology when interpreting results and evaluating methodology.