When you judge someone’s performance, it’s important to give

positive feedback along with any criticisms (things to improve). This means to point out both something they did well and something they can do better.
In America, the “criticism sandwich” is one way to do this. To make this type of sandwich, you begin with a positive, then a negative, and end with another positive. The two positives are like the two outer slices of bread, which is why it’s called a “sandwich.”