In this study, the implementation of a STEAM project was critically examined, with constructivist grounded principles utilized to inform the perspective of both a learner and a STEAM practitioner. A comprehensive project plan was devised that incorporated CAP domains through the integration of the STEAM praxis with peer and self-assessment strategies for school-level science education. This innovative approach, aimed at nurturing the aesthetic value in arts and the evaluation process, led to the creation of a unique methodology for assessing students' cognitive and psychomotor skills. The framework for accessing students' peer/self-evaluation via meticulously designed rubrics is further highlighted. The implementation of a project plan proved to be an interactive and insightful process, fostering a profound understanding of students' concerns and interests. This study underscores the transformative potential of the STEAM approach in educational settings, highlighting its role in promoting critical thinking, creativity, and problem-solving skills among students. [This article was presented at Conference on Recent Trends in Science, Technology, and Innovation-2024, held in-person in Pokhara 33700, Nepal on February 22, 2024.]