What are evidence-based ways to increase student engagement?

The critical starting point: engagement and learning are not the same thing. Optimizing for time-on-task, completion rates, or "fun" is easy to measure — but a lively activity with zero durable learning is a trap. The strongest evidence points to engagement that results from genuine learning, not the other way around.

What actually works:

1. Make students do the thinking. Active recall (testing, predicting, explaining) beats passive watching. The act of retrieving information from memory is what builds lasting memory — the testing effect is one of the most robust findings in learning science (Roediger & Karpicke 2006; Adesope, Trevisan & Sundararajan 2017). Effortful participation is engaging and it's how real learning happens.
2. Pitch challenge to what students already know. Prior knowledge is the single best predictor of new learning. Work that's too easy bores; too hard defeats. The sweet spot — connecting new material to existing knowledge — drives both attention and learning.
3. Provide autonomy and visible progress. Self-determination theory (autonomy, competence, relatedness) shows that letting students choose between defensible options and surfacing real progress on dimensions students care about are durable motivators.

Be cautious with extrinsic gamification (points, badges, streaks). When bolted onto tasks students find intrinsically interesting, it can undermine motivation by shifting focus from the task to the reward. Use gamification only if it provides real information, not just control.