La Laguna University has been offering courses for the development of spatial skills since 2004. Each year since that time spatial ability of engineering students has been measured before and after the courses to check progress after each training session. We have developed a spatial skills training course based on augmented reality and graphic engineering contents, and designed the AR_Dehaes tool, which is based on its own library the uses computer vision techniques for incorporating visual objects through fiducial markers in the real world