Describir: SVA and the Tscherny Principles /

 _    _     _____     ______     ___                 ___      _____   
| \  / ||  |  ___||  /_____//   / _ \\    ____      / _ \\   / ____|| 
|  \/  ||  | ||__    `____ `   | / \ ||  |    \\   / //\ \\ / //---`' 
| .  . ||  | ||__    /___//    | \_/ ||  | [] ||  |  ___  ||\ \\___   
|_|\/|_||  |_____||  `__ `      \___//   |  __//  |_||  |_|| \_____|| 
`-`  `-`   `-----`   /_//       `---`    |_|`-`   `-`   `-`   `----`  
                     `-`                 `-`                          
  _____   
 |  ___|| 
 | ||__   
 | ||__   
 |_____|| 
 `-----`