Dedication

To my father Eddie, who inspired me to use computers and infected me with his dream of going to MIT .

To my mother Chichi, who always insisted on the value and enjoyment of reading.

To my wife Liliana, who values ​​the things I do (always) and is proud of me (almost always).

To Domingo, Teresa and Francisco, which are our greatest challenge, and our happiest adventure.

To my uncle Jorge A. Rizzi (h), which gave me my first job in SADOI, twice.

To Jorge A. Rey Valzacchi, pioneer in Argentina of the integration of technology in education.

To Rosa Kaufman, pioneer of the LOGO in education in Argentina.

To my friends, who never understood what I work for, but they love me just the same.