This article introduces the spider web or radar method as an innovative project evaluation model aimed at enhancing the development of mathematical thinking through environmental olympiads among middle school students. This method was specifically applied to evaluate student projects centered on water conservation and mathematical modeling. The evaluation dimensions included creativity, mathematical modeling, environmental awareness, presentation skills, and problem-solving abilities. By employing this visualization-based model, we meticulously analyzed performance across these dimensions, highlighting the flexibility of the method to accommodate modifications such as dimensional weighting and criterion-specific graphing. The research outcomes demonstrate the model's efficacy in benchmarking and identifying relative strengths and weaknesses across multiple projects, thereby facilitating targeted improvements. The spider web method's adaptability and its potential for broad application in educational and project evaluation contexts are significant contributions. It offers a quantifiable means to enhance pedagogical strategies and student engagement in environmental and mathematical education. The novelty of this research lies in its approach of combining environmental awareness with mathematical learning, leveraging a visual evaluation tool to foster a comprehensive educational experience. This scientific contribution not only enriches the field of educational evaluation but also underscores the potential of interdisciplinary teaching methods to cultivate critical thinking and problem-solving skills among students. Keywords: olympiads, evaluative model, projects, radar graphs, mathematical modeling DOI: https://doi.org/10.35741/issn.0258-2724.59.2.7