<b>A Phenomenological Validation on 5A’s Pedagogical Model: An Interdisciplinary STEM Education Framework  </b>

This research examines expert opinions about the 5A's Pedagogical Model's clarity, relevance, completeness, and viability in order to validate it as a framework for interdisciplinary STEM education. A qualitative phenomenological design was used to examine the lived experiences of twelve expert validators from K–12 and higher education using Colaizzi’s technique. The primary data gathering method was semi-structured interviews, which enabled participants to provide comprehensive insights on the model's advantages and shortcomings. The results showed that the model's organized phases—Association, Action, Abstraction, Assessment, and Assimilation—were very effective in integrating science and mathematics while fostering deeper conceptual comprehension and significant interdisciplinary links. However, in order to improve usability and consistency, experts emphasized the use of classroom exemplars, organized guidelines, clear evaluation rubrics, and the incorporation of digital resources. The primary challenges identified were practical in nature, such as the need for continuous teacher training, adequate preparation, strong institutional backing, and sufficient resources.