The Improvement by Module chart, in the bottom-right of the Classroom Performance tab, plots how class accuracy is changing module by module over time. It's one of the most useful visualizations in the platform for instructional planning.
What the Chart Shows
The y-axis shows Accuracy Change (%) — a positive number means students are doing better than they did at baseline, a negative number means they're doing worse.
The x-axis shows Module number in sequence as the class progresses through the course.
A line connects the modules in order, letting you visually trace the class's accuracy trajectory.
What "Avg" Means at the Top
In the top-right corner of the chart, you'll see "Avg: X%" — this is the average accuracy change across all modules covered so far. It's a summary statistic for "overall, is the class trending up or down?"
A healthy classroom shows:
Avg: 0% to +5% — Normal. Students are holding steady or slightly improving.
Avg: +5% to +15% — Strong. Real learning gains are happening.
Avg: -5% to 0% — Watch closely. Slight decline could mean fatigue or content drift.
Avg: below -5% — Action needed. Something is structurally wrong with pacing or content fit.
Reading the Line Shape
The shape of the line tells different stories:
Steady upward trend Lessons are building on each other effectively. Students are gaining momentum. Keep pacing as is.
Steady downward trend Students are losing ground as the course progresses. Possible causes: content getting harder faster than students can keep up, accumulated misunderstanding from earlier modules, or fatigue. Slow down and review.
Flat line near zero Students are neither gaining nor losing. They're working consistently but not deepening their understanding. May indicate they're doing the bare minimum to complete lessons.
Spiky / variable Some modules click, others don't. This is actually normal — it means specific content is harder than others. Use it to identify which modules to re-teach or supplement.
Sudden drop after a specific module A particular module disrupted student confidence. Drill into that module's lesson-level data to see which specific concept caused the trouble.
Using the Chart for Re-Teaching Decisions
The Improvement by Module chart is the single best signal for "what should I re-teach?"
Look for the largest dip in the line.
Identify which module corresponds to that dip.
Open the Module-by-Module Breakdown below the chart and find that module.
Drill into specific lessons within the module that have the highest Total Missed Questions.
Plan a re-teach focused on those specific lessons, not the whole module.
Using the Chart for Pacing Decisions
Sustained downward trends signal that you're moving too fast. Sustained upward trends signal that you might be able to push faster.
Most teachers find that a flat-to-slightly-positive trend is the goal. Big positive swings are great but unsustainable — students plateau eventually. Big negative swings are warning signs.
Comparing Across Classes
If you teach multiple periods of the same course, compare the Improvement by Module chart across classrooms. If one period is trending up and another is trending down, the issue is class-specific (engagement, classroom culture, time of day) rather than curriculum-specific.
Related articles:
7.1 Classroom Performance Tab Explained
7.3 Identifying Students Who Need Support
7.5 Drilling into Module-Level Performance