We are a group of 11 students of 4th grade at the public high school “INS Can Jofresa" in Terrassa (Spain). We are Jordi Carmona, Rubén Casado, Arnau Domínguez, Adrià Gonzàlez, Daniel Lao, Sergi Marzà, Jana Pladeveya,  Hugo Sánchez , Cristina Segura and Iván Valdivia, and with our mentor Lola Garcia and our coach Gabriel Blanes, we make up The Lego Stones. This year we are participating in the First Lego League. The challenge that the organization proposes is called World Class, and it's about thinking how we could find a way to improve our learning process.