Estimated mastery (color)
True mastery (bar height)
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This simulation illustrates formative assessment — a process used to monitor student learning during instruction. A classroom of 24 students grows in hidden true mastery day by day, while periodic low-stakes formative checks sample that mastery with realistic measurement noise and update a teacher-visible estimate through an exponentially-weighted moving average. When the class estimate falls below a mastery threshold, the simulation automatically switches into a reteach mode that boosts growth for struggling students at the cost of overall pace, demonstrating how ongoing feedback and adjustments guide students toward mastery of concepts and skills through continuous improvement rather than a single end-of-unit judgment.