Why ARCHITECTURAL PRINCIPLES?"Organized principles are visual methods that allow the form and the space of a building to co-exist in order to make design complete". These notes are the result of the lectures in CUIB, and I and my students tried during the Academic Year to answer to this question. A Civil Engineer has the huge responsibility to transform the landscape with his work and from this work we can see if he is working for the good of the people or only for his own benefit. A young engineer can find in these pages a kind of answer in order to going out of the..."box" and take into consideration an essential aspect of the design of a structure: aesthetic !