Expertise reversal effect means that
This means that many practices that are helpful to novices are inefficient for experts due to the difference in knowledge. Information that might be crucial for novices to understand something is already well known and redundant2) to the experts so it may produce unnecessary extraneous load.3)
In practice, expert reversal effect means learning materials should be adjusted to users depending on their expertise level (prior knowledge). For example, studying worked examples is effective for novices, but due to prior knowledge practice and solving problems becomes more and more effective technique as the expertise level increases. Also,
To deal with this effect, a rapid test of knowledge has been proposed.5)