HanziHero has a built-in spaced repetition system that is charge of scheduling your reviews.
Spaced repetition is a technique for spacing out reviews according to their difficulty. It does this by leveraging the science of memory and forgetting to schedule optimal review times. A spaced repetition system is any system that uses this technique for scheduling reviews. You can read more about spaced repetition and how we leverage it within the application here on our website.
Each item in HanziHero has an associated SRS stage. This SRS stage corresponds to how well HanziHero thinks you know the item.
The higher the SRS stage, the less frequently it will show up in your reviews. Conversely, the lower the stage, the more frequently you will see it in your reviews.
If you answer it correctly, the SRS stage will increase. Likewise, if you answer it incorrectly, it will go down so that you can review it more frequently.