Describir: Models of failure

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