The researchers studied how different types of drought-resistant durum wheat perform in different environments. They grew 25 wheat types in six different places and found that the environment had the biggest impact on grain yield, followed by the interaction between wheat types and environments, and then the wheat types themselves. They identified some wheat types that were consistently good performers across different environments. By analyzing the data, they found that two main factors explained most of the differences in performance between wheat types and environments. They also grouped the environments into two main categories based on how similar they were in terms of wheat performance.