Multilicenciadamente This work is published under the terms of the following licenses. Therefore, you are free to reproduce, distribute, publicly display, interpret and transform, by any means, with or without profit, this book, at any time or place, licensing or multilicenciando, as appropriate, the work original or derivative work under the terms of one of the following licenses or under the terms of a subset of them:. Free Documentation License (GNU FDL: Free Documentation License) as published by the Free Software Foundation (FSF) or version 1. 2 or (at your preference) any later version of the GNU FDL published by the FSF ; no Invariant Sections, no text on the page and no text on the back cover. GNU General Public License (GNU GPL: General Public License), either version 2 or (at your preference) any later version of the GNU GPL published by the FSF. The engineer must be able to identify and understand the limitations (availability of material, human, technical and economic) and requirements (utility, safety, cost, appearance) applicable to the object or system that aims to design and build. From this set of requirements, and using their knowledge of physics, chemistry, mathematics, economics, etc. , And his own experience, the engineer proposes appropriate solutions to the problem. In most cases, the solution will be unique, so it will be necessary to evaluate the different options to choose the optimum. Although it is believed that aerospace engineering book is a relatively recent, in 1612, Sebastián de Covarrubias said in his "Tesoro de la Lengua Catellanos" And so we called an engineer who builds machines to defend and offend the enemy . . and even before that time were called engineers who understood the machinery of any kind other than the military. .