The teachers involved agreed to create a class in Classroom where all the students were added using a link.

We used Classroom to have a solid and easy communication between teachers and students.

Classroom was organised using topics where we attached all the information needed, the tasks that students had to fulfill and the rubrics used to assess the work.

Teachers built a sample castle. The castle chosen was "Carrickfergus Castle" located in North Ireland.

We showed it to students so that they had a rough idea of what we asked them to do. Another reason was to motivate them to build something more complex than just a carboard with information written in it.

We used paper, cardboard, foam cardboard, brochettes, adhesive tape and white glue.

As we did with the castle, we built a catapult as an example of what they had to do.

We used wood as main material, but there were more materials involved: rope, nails, elastic bands and a piece of metal.

Torsion through a rope was used as an energy accumulation effort.