In the society of the 21st century, the teacher must be a guide convinced that one cannot teach with the tools of the past if one wants to train the citizens of a future that, properly speaking and, to tell the truth, is already among us. This book, the publication of which we await with great anticipation, is the result of research work that has been presented at conferences and recommended for publication. Chapter I deals with the problem of evaluation in rather general terms. Chapter II offers a didactic strategy involving body movements treated with different methodological resources and the use of different materials. Chapter III examines Archimedes’ principle by means of a didactic sequence using a variety of resources. Chapter IV introduces the subject of simple harmonic motion, where mathematics is used as the basis for the equations and graphs. To close our work proposal, chapter V deals with the research topic of this group, which currently refers to the theory of competences.