the ability to maintain a consistent level of academic or behavioral achievement over a long period of time, demonstrating personality maturity, consistency of effort, and psychological resilience. In the school environment, the stability of academic performance is an indicator of the effectiveness of learning, the adequacy of curricula, the quality of assessment and students’ self-regulation skills. It also helps teachers predict student outcomes, provide continuous and adaptive support, and reduce sharp fluctuations in academic performance, thereby supporting a sustainable learning process based on gradual development.